diff --git a/.githooks/post-commit b/.githooks/post-commit
index 96a00dc..ad605ea 100755
--- a/.githooks/post-commit
+++ b/.githooks/post-commit
@@ -4,6 +4,8 @@
 # holds. Never fails the commit: no origin / offline / refused → warning only.
 # Opt out for one command with GITFLOW_NO_PUSH=1 (throwaway repos, tests).
 [ "${GITFLOW_NO_PUSH:-0}" = 1 ] && exit 0
+# Per-repo opt-out (no push rights on a foreign clone): git config gitflow.autopush false
+[ "$(git config --bool --default true gitflow.autopush)" = false ] && exit 0
 git remote get-url origin >/dev/null 2>&1 || exit 0
 br=$(git symbolic-ref --short -q HEAD 2>/dev/null) || exit 0   # detached HEAD — nothing to track
 if command -v timeout >/dev/null 2>&1; then t="timeout ${GITFLOW_PUSH_TIMEOUT:-30}"; else t=""; fi
diff --git a/.githooks/post-merge b/.githooks/post-merge
index 66325f3..0456217 100755
--- a/.githooks/post-merge
+++ b/.githooks/post-merge
@@ -4,6 +4,8 @@
 # holds. Never fails the commit: no origin / offline / refused → warning only.
 # Opt out for one command with GITFLOW_NO_PUSH=1 (throwaway repos, tests).
 [ "${GITFLOW_NO_PUSH:-0}" = 1 ] && exit 0
+# Per-repo opt-out (no push rights on a foreign clone): git config gitflow.autopush false
+[ "$(git config --bool --default true gitflow.autopush)" = false ] && exit 0
 git remote get-url origin >/dev/null 2>&1 || exit 0
 br=$(git symbolic-ref --short -q HEAD 2>/dev/null) || exit 0   # detached HEAD — nothing to track
 if command -v timeout >/dev/null 2>&1; then t="timeout ${GITFLOW_PUSH_TIMEOUT:-30}"; else t=""; fi
diff --git a/.githooks/pre-commit b/.githooks/pre-commit
index 1efe956..ef3abef 100755
--- a/.githooks/pre-commit
+++ b/.githooks/pre-commit
@@ -20,17 +20,22 @@ else
   echo "gitflow pre-commit: gitleaks not installed — secret scan skipped (https://github.com/gitleaks/gitleaks)." >&2
 fi
 
+# Per-repo opt-out of the branch model (a clone of a foreign project):
+#   git config gitflow.protect false
+[ "$(git config --bool --default true gitflow.protect)" = false ] && exit 0
+
 case "$br" in
   main|develop) ;;                        # protected — keep checking
   *) exit 0 ;;                                              # working branch — allow
 esac
 
-# whitelist: all-staged-under-.claude/ (memory/doc/deploy helpers) — allow
-if [ -z "$(git diff --cached --name-only | grep -v '^\.claude/' | head -1)" ]; then
+# whitelist: all-staged-under-.claude/ (memory/doc/deploy helpers) or
+# .githooks/ (the hooks themselves, refreshed by the lib) — allow
+if [ -z "$(git diff --cached --name-only | grep -vE '^\.(claude|githooks)/' | head -1)" ]; then
   exit 0
 fi
 
 echo "gitflow pre-commit: BLOCKED — direct commit on '$br'." >&2
 echo "  Branch from the right base (feature/bugfix->develop, hotfix->main), or merge." >&2
-echo "  (.claude/** memory commits are exempt; --no-verify bypasses locally.)" >&2
+echo "  (.claude/** and .githooks/** commits are exempt; foreign clone? git config gitflow.protect false)" >&2
 exit 1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 946cabe..45b774a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -56,13 +56,30 @@ Format follows [Keep a Changelog](https://keepachangelog.com/).
   hooks next to `pre-commit` that push the current branch after every
   commit and merge (`--follow-tags`, 30 s timeout, `GITFLOW_NO_PUSH=1` to
   opt out in throwaway repos). A failed push warns loudly and never blocks
-  the commit. Existing projects get the hooks by re-running
-  `bash ~/.claude/lib/gitflow.sh install-hook`. Covered by `gitflow-test.sh`
-  T18 (bare origin: start, commit, opt-out, unreachable origin, finish) and
-  T19 (installed hooks equal the emitted ones, LRN-114 drift gate).
+  the commit. Nothing to run per project: `make link` generates `githooks/`
+  from the lib and sets git's global `core.hooksPath` to
+  `~/.claude/githooks`, so every repo on the machine runs the three hooks,
+  and `hooks/session-start.sh` refreshes a repo's own `.githooks/` when it
+  lags the lib (`gitflow reconcile-hooks`). Per-repo opt-outs for a foreign
+  clone: `git config gitflow.protect false`, `git config gitflow.autopush
+  false`. `make doctor` checks both. The pre-commit exemption now covers
+  `.githooks/**` next to `.claude/**`. `make test` and the suites that
+  commit on `main` run with `GIT_CONFIG_GLOBAL=/dev/null`, so the global
+  hooks never fire in throwaway repos. Covered by `gitflow-test.sh` T18
+  (bare origin: start, commit, opt-outs, unreachable origin, finish), T19
+  (installed and generated hooks equal the emitted ones, LRN-114 drift
+  gate), T20 (reconcile) and T21 (whitelist and protect opt-out).
 - `hooks/unpushed-guard.sh` on `SessionStart` and `Stop`: a warning when the
   branch is ahead of its upstream, has no upstream, or has no `origin`; at
   session start also the count of uncommitted changes. Non-blocking.
+- `make doctor` gains two sections: "Git hooks" (global `core.hooksPath`
+  set, generated `githooks/` equal to the emitters) and "Scratchpad": a
+  warning when `TMPDIR` sits on a tmpfs mounted with `usrquota`. systemd
+  mounts `/tmp` that way by default and caps each user at 80 % of its
+  size, so Claude's tool outputs share one quota across every session and
+  sub-agent, and one fat probe directory kills every shell at once (this
+  happened twice on 2026-09-22, BLK-021). Fix: launch claude with
+  `TMPDIR=$HOME/.cache/claude-tmp`.
 - `lib/tests/guard-bash.test.sh`: the executable spec of a PreToolUse Bash
   guard (transfer tools, sync deletes, recursive `rm` outside the project,
   bulk permissions, privilege escalation, disk tools, docker privileges and
@@ -179,7 +196,9 @@ Format follows [Keep a Changelog](https://keepachangelog.com/).
   docker socket and `-v /:`, and git history destruction (`push --delete`,
   `--mirror`, `:ref`, `--force-with-lease`, `branch -D`, `filter-branch`,
   `reflog expire`, `stash clear`/`drop`, `clean -f`, `--no-verify`,
-  `core.hooksPath`). The pipe-to-shell and stash entries left `ask`, which is
+  `core.hooksPath`, the `GIT_CONFIG_GLOBAL=` / `GIT_CONFIG=` env prefixes
+  and the per-repo `gitflow.*` opt-outs, which belong to the human). The
+  pipe-to-shell and stash entries left `ask`, which is
   unreliable under auto mode. New `autoMode.hard_deny`: a destructive tool
   aimed at a path built from a variable, `~`, `..`, a wildcard, or outside
   the project and the temp dir, including as a trace or a rehearsal that a
diff --git a/CLAUDE.global.md b/CLAUDE.global.md
index 90b550e..924782c 100644
--- a/CLAUDE.global.md
+++ b/CLAUDE.global.md
@@ -194,14 +194,19 @@ flows (`/feat` `/bugfix` `/hotfix`) and the standalone memory/doc `chore`
 skills auto-branch on a protected base but commit in place on a working branch,
 never finishing — so those skills branch to `chore/*` via the aiguillage, not
 the `.claude/**` exemption. New/onboarded projects get the model + the
-versioned pre-commit hook via `gitflow init`. Advisory, so two deterministic
-backstops apply: the per-repo pre-commit hook (blocks code commits on
-main/develop, exempts `.claude/**` + merges + the root commit) and Gitea branch
+versioned hooks via `gitflow init`. Advisory, so deterministic backstops
+apply: the pre-commit hook (blocks code commits on main/develop, exempts
+`.claude/**` + `.githooks/**` + merges + the root commit) and Gitea branch
 protection on `main`/`develop`. Don't lean on `--no-verify` to bypass them.
-Every branch is pushed at `start` and every commit as it lands: `gitflow init`
-/ `install-hook` write post-commit and post-merge hooks that push to `origin`
-(warn, never block, when it fails); `GITFLOW_NO_PUSH=1` is for throwaway test
-repos only. A branch ahead of its upstream is a defect, not a state.
+Every branch is pushed at `start` and every commit as it lands by the
+post-commit and post-merge hooks (warn, never block, on failure). The three
+hooks run in EVERY repo on the machine: `make link` generates `githooks/`
+from the lib and sets git's global `core.hooksPath` to `~/.claude/githooks`;
+a repo that ran `gitflow init` keeps its own `.githooks/`, refreshed at
+session start when it lags the lib. Foreign clone: `git config
+gitflow.protect false` / `gitflow.autopush false`. `GITFLOW_NO_PUSH=1` is
+for throwaway test repos only. A branch ahead of its upstream is a defect,
+not a state.
 
 ## Security — non-negotiable defaults
 
diff --git a/Makefile b/Makefile
index 7002ce1..18fa55e 100644
--- a/Makefile
+++ b/Makefile
@@ -29,7 +29,10 @@ seo-connect: ## Connect a Google account for /seo FULL (creates venv, OAuth cons
 	 bash lib/seo-data/connect.sh --label "$$label"'
 
 test: ## Run deterministic tests (lib/tests/*.test.sh + lib/gitflow-test.sh + lib/tests/run-*.sh)
-	@fail=0; for t in lib/tests/*.test.sh lib/seo-data/*.test.sh lib/gitflow-test.sh lib/tests/run-*.sh; do \
+	@# Hermetic git: the machine's global core.hooksPath (BDR-095) must not
+	@# fire inside the throwaway repos the suites build.
+	@export GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_SYSTEM=/dev/null; \
+	fail=0; for t in lib/tests/*.test.sh lib/seo-data/*.test.sh lib/gitflow-test.sh lib/tests/run-*.sh; do \
 		echo "== $$t"; \
 		case "$$(basename "$$t")" in \
 			run-release-candidate.sh) RC_WORK=$$(mktemp -d) RC_TAG=1 bash "$$t" || fail=1 ;; \
diff --git a/doctor.sh b/doctor.sh
index ae12d13..3c5afa5 100644
--- a/doctor.sh
+++ b/doctor.sh
@@ -314,6 +314,47 @@ fi
 
 echo ""
 
+# ────────────────────────────────────────────────────────────
+# 5b. Git hooks (BDR-095): global core.hooksPath + generated githooks/
+# ────────────────────────────────────────────────────────────
+echo "── Git hooks ──"
+_gh_cfg=$(git config --global core.hooksPath 2>/dev/null || true)
+# literal tilde accepted: git expands it itself (see link.sh)
+# shellcheck disable=SC2088
+if [ "$_gh_cfg" = '~/.claude/githooks' ] || [ "$_gh_cfg" = "$HOME/.claude/githooks" ]; then
+  pass "global core.hooksPath → $_gh_cfg (every repo protected + auto-pushed)"
+else
+  warn "global core.hooksPath is '${_gh_cfg:-unset}' — expected ~/.claude/githooks (run: make link)"
+fi
+for _h in pre-commit post-commit post-merge; do
+  if [ ! -f "$REPO/githooks/$_h" ]; then
+    warn "githooks/$_h missing (run: make link)"
+  elif ! diff -q <(bash "$REPO/lib/gitflow.sh" emit-hook "$_h" 2>/dev/null) "$REPO/githooks/$_h" >/dev/null 2>&1; then
+    warn "githooks/$_h lags lib/gitflow.sh (run: make link)"
+  else
+    pass "githooks/$_h matches lib/gitflow.sh"
+  fi
+done
+unset _gh_cfg _h
+echo ""
+
+# ────────────────────────────────────────────────────────────
+# 5c. Scratchpad (BLK-021): Claude's tool outputs live under $TMPDIR; on a
+# tmpfs with a per-user quota (systemd mounts /tmp with usrquota and caps
+# each user at 80% of its size) one fat probe kills every session's shell.
+# ────────────────────────────────────────────────────────────
+echo "── Scratchpad ──"
+_sp="${TMPDIR:-/tmp}"
+_sp_fs=$(findmnt -no FSTYPE -T "$_sp" 2>/dev/null || echo "?")
+_sp_opts=$(findmnt -no OPTIONS -T "$_sp" 2>/dev/null || true)
+if [ "$_sp_fs" = tmpfs ] && printf '%s' "$_sp_opts" | grep -q usrquota; then
+  warn "TMPDIR=$_sp is a tmpfs with a per-user quota — every session's shell dies when it fills (BLK-021). Launch claude with TMPDIR=\$HOME/.cache/claude-tmp"
+else
+  pass "TMPDIR=$_sp on $_sp_fs (no per-user tmpfs quota in the way)"
+fi
+unset _sp _sp_fs _sp_opts
+echo ""
+
 # ────────────────────────────────────────────────────────────
 # 6. Token budget estimate
 # ────────────────────────────────────────────────────────────
diff --git a/githooks/post-commit b/githooks/post-commit
new file mode 100755
index 0000000..ad605ea
--- /dev/null
+++ b/githooks/post-commit
@@ -0,0 +1,15 @@
+#!/bin/sh
+# gitflow post-commit — generated by gitflow_init. Do not hand-edit.
+# Pushes every commit as it lands (BDR-095): a remote only backs up what it
+# holds. Never fails the commit: no origin / offline / refused → warning only.
+# Opt out for one command with GITFLOW_NO_PUSH=1 (throwaway repos, tests).
+[ "${GITFLOW_NO_PUSH:-0}" = 1 ] && exit 0
+# Per-repo opt-out (no push rights on a foreign clone): git config gitflow.autopush false
+[ "$(git config --bool --default true gitflow.autopush)" = false ] && exit 0
+git remote get-url origin >/dev/null 2>&1 || exit 0
+br=$(git symbolic-ref --short -q HEAD 2>/dev/null) || exit 0   # detached HEAD — nothing to track
+if command -v timeout >/dev/null 2>&1; then t="timeout ${GITFLOW_PUSH_TIMEOUT:-30}"; else t=""; fi
+if $t git push -q -u --follow-tags origin "$br" >/dev/null 2>&1; then exit 0; fi
+echo "gitflow post-commit: push of '$br' FAILED — this commit exists only on this disk." >&2
+echo "  Push by hand: git push -u origin $br   (rejected as non-fast-forward? never force-push; ask first)" >&2
+exit 0
diff --git a/githooks/post-merge b/githooks/post-merge
new file mode 100755
index 0000000..0456217
--- /dev/null
+++ b/githooks/post-merge
@@ -0,0 +1,15 @@
+#!/bin/sh
+# gitflow post-merge — generated by gitflow_init. Do not hand-edit.
+# Pushes every commit as it lands (BDR-095): a remote only backs up what it
+# holds. Never fails the commit: no origin / offline / refused → warning only.
+# Opt out for one command with GITFLOW_NO_PUSH=1 (throwaway repos, tests).
+[ "${GITFLOW_NO_PUSH:-0}" = 1 ] && exit 0
+# Per-repo opt-out (no push rights on a foreign clone): git config gitflow.autopush false
+[ "$(git config --bool --default true gitflow.autopush)" = false ] && exit 0
+git remote get-url origin >/dev/null 2>&1 || exit 0
+br=$(git symbolic-ref --short -q HEAD 2>/dev/null) || exit 0   # detached HEAD — nothing to track
+if command -v timeout >/dev/null 2>&1; then t="timeout ${GITFLOW_PUSH_TIMEOUT:-30}"; else t=""; fi
+if $t git push -q -u --follow-tags origin "$br" >/dev/null 2>&1; then exit 0; fi
+echo "gitflow post-commit: push of '$br' FAILED — this commit exists only on this disk." >&2
+echo "  Push by hand: git push -u origin $br   (rejected as non-fast-forward? never force-push; ask first)" >&2
+exit 0
diff --git a/githooks/pre-commit b/githooks/pre-commit
new file mode 100755
index 0000000..ef3abef
--- /dev/null
+++ b/githooks/pre-commit
@@ -0,0 +1,41 @@
+#!/bin/sh
+# gitflow pre-commit — generated by gitflow_init. Do not hand-edit.
+# Mirrors gitflow_protected_base (lib/gitflow.sh). Drift caught by T10.
+gd=$(git rev-parse --git-dir)
+br=$(git symbolic-ref --short -q HEAD 2>/dev/null)
+
+git rev-parse --verify -q HEAD >/dev/null 2>&1 || exit 0   # root commit — allow
+[ -f "$gd/MERGE_HEAD" ] && exit 0                          # merge in progress — allow
+
+# Secret backstop (job7) — any branch, not just protected ones. Non-blocking
+# if gitleaks isn't installed; auto-discovers ./.gitleaks.toml (repo root).
+if command -v gitleaks >/dev/null 2>&1; then
+  if ! gitleaks git --staged --no-banner >/dev/null 2>&1; then
+    echo "gitflow pre-commit: BLOCKED — gitleaks found a secret in staged changes." >&2
+    echo "  Details: gitleaks git --staged --no-banner" >&2
+    echo "  Genuine false-positive? add an allowlist rule to .gitleaks.toml — never bypass with --no-verify." >&2
+    exit 1
+  fi
+else
+  echo "gitflow pre-commit: gitleaks not installed — secret scan skipped (https://github.com/gitleaks/gitleaks)." >&2
+fi
+
+# Per-repo opt-out of the branch model (a clone of a foreign project):
+#   git config gitflow.protect false
+[ "$(git config --bool --default true gitflow.protect)" = false ] && exit 0
+
+case "$br" in
+  main|develop) ;;                        # protected — keep checking
+  *) exit 0 ;;                                              # working branch — allow
+esac
+
+# whitelist: all-staged-under-.claude/ (memory/doc/deploy helpers) or
+# .githooks/ (the hooks themselves, refreshed by the lib) — allow
+if [ -z "$(git diff --cached --name-only | grep -vE '^\.(claude|githooks)/' | head -1)" ]; then
+  exit 0
+fi
+
+echo "gitflow pre-commit: BLOCKED — direct commit on '$br'." >&2
+echo "  Branch from the right base (feature/bugfix->develop, hotfix->main), or merge." >&2
+echo "  (.claude/** and .githooks/** commits are exempt; foreign clone? git config gitflow.protect false)" >&2
+exit 1
diff --git a/hooks/session-start.sh b/hooks/session-start.sh
index 36b9584..029fafc 100644
--- a/hooks/session-start.sh
+++ b/hooks/session-start.sh
@@ -44,6 +44,17 @@ else
 fi
 unset _lib
 
+# ── gitflow hooks reconcile (BDR-095) ──
+# A repo's .githooks/ lags lib/gitflow.sh until someone re-runs install-hook
+# (LRN-114). Do it here, once per session, silently when current; the lib
+# prints the refreshed names, shown in the banner with a commit reminder.
+GF_REFRESHED=""
+_gf_lib="$(dirname "${BASH_SOURCE[0]}")/../lib/gitflow.sh"
+if [ -f "$_gf_lib" ] && git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
+  GF_REFRESHED=$(bash "$_gf_lib" reconcile-hooks 2>/dev/null | sed -n 's/^gitflow hooks refreshed: *//p')
+fi
+unset _gf_lib
+
 # ── Toggle plugin detection ──
 
 TOGGLE_ACTIVE=()
@@ -199,6 +210,11 @@ unset _active_count _inactive_count
 printf "│  🖥️  CLI : %-40s│\n" "$GSD_STATUS"
 [ -n "$TOKEN_WARN" ] && printf "│  💰 %-44s│\n" "${TOKEN_WARN:0:44}"
 printf "│  📦 v%-45s│\n" "$CONFIG_VERSION"
+if [ -n "$GF_REFRESHED" ]; then
+  _gf_line="hooks refreshed: $GF_REFRESHED → commit .githooks/"
+  printf "│  🪝 %-44s│\n" "${_gf_line:0:44}"
+  unset _gf_line
+fi
 # CLAUDE.global.md line-count guard (anti-regression). BDR-062 supersedes
 # BDR-031's 275 target: 305 is the assumed reality (extraction done at
 # job1; further compression costs clarity > token gain) — warn past 320.
diff --git a/lib/gitflow-test.sh b/lib/gitflow-test.sh
index cb452b8..d9b3dde 100644
--- a/lib/gitflow-test.sh
+++ b/lib/gitflow-test.sh
@@ -314,6 +314,10 @@ echo w>w; git add w; git commit -q -m w 2>/dev/null
 chk "T18b commit pushed by post-commit"   '[ "$(git rev-parse HEAD)" = "$(git -C "$bare" rev-parse feature/ap)" ]'
 echo w2>>w; git add w; GITFLOW_NO_PUSH=1 git commit -q -m w2 2>/dev/null
 chk "T18c GITFLOW_NO_PUSH=1 → not pushed" '[ "$(git rev-parse HEAD)" != "$(git -C "$bare" rev-parse feature/ap)" ]'
+git config gitflow.autopush false
+echo w2b>>w; git add w; git commit -q -m w2b 2>/dev/null
+chk "T18h gitflow.autopush=false → not pushed" '[ "$(git rev-parse HEAD)" != "$(git -C "$bare" rev-parse feature/ap)" ]'
+git config --unset gitflow.autopush
 git remote set-url origin /nonexistent/x.git
 echo w3>>w; git add w
 # shellcheck disable=SC2034  # ap_out/ap_rc are read by the deferred chk evals
@@ -337,6 +341,40 @@ if [ -d "$HERE/../.githooks" ]; then
 else
   ok "T19 skipped (no .githooks next to the lib)"
 fi
+if [ -d "$HERE/../githooks" ]; then
+  for h in pre-commit post-commit post-merge; do
+    chk "T19d global githooks/$h == emitted" "diff -q <(_gitflow_emit_hook $h) \"$HERE/../githooks/$h\" >/dev/null"
+  done
+else
+  ok "T19d skipped (no githooks/ next to the lib — run make link)"
+fi
+
+echo "T20 — reconcile-hooks: a stale .githooks/ is refreshed, a current one is left alone"
+newrepo rec; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+rm -f .githooks/post-commit; echo "# stale" >> .githooks/pre-commit
+# shellcheck disable=SC2034
+rec_out="$(gitflow_reconcile_hooks 2>/dev/null)"
+chk "T20a names the refreshed hooks"      'printf "%s" "$rec_out" | grep -q "pre-commit" && printf "%s" "$rec_out" | grep -q "post-commit"'
+chk "T20b pre-commit rewritten == emitted" 'diff -q <(_gitflow_emit_pre_commit) .githooks/pre-commit >/dev/null'
+chk "T20c post-commit restored"            '[ -x .githooks/post-commit ]'
+chk "T20d second run is silent"            '[ -z "$(gitflow_reconcile_hooks 2>/dev/null)" ]'
+mkdir -p sub; cd sub || exit 1; echo "# stale" >> ../.githooks/post-merge
+chk "T20e works from a subdirectory"       'gitflow_reconcile_hooks 2>/dev/null | grep -q post-merge'
+cd .. || exit 1
+newrepo plain; echo a>a; git add a; git commit -q -m a
+chk "T20f non-gitflow repo → silent, no .githooks created" '[ -z "$(gitflow_reconcile_hooks 2>/dev/null)" ] && [ ! -d .githooks ]'
+
+echo "T21 — pre-commit whitelist + per-repo protect opt-out"
+newrepo wl; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+git checkout -q develop
+echo "# tweak" >> .githooks/post-merge; git add .githooks/post-merge
+chk "T21a .githooks/-only commit on develop → allowed" '.githooks/pre-commit 2>/dev/null'
+echo code>code.txt; git add code.txt
+chk "T21b .githooks/ + code on develop → blocked"    '! .githooks/pre-commit 2>/dev/null'
+git config gitflow.protect false
+chk "T21c gitflow.protect=false → allowed"           '.githooks/pre-commit 2>/dev/null'
+git config --unset gitflow.protect
+git restore --staged code.txt .githooks/post-merge 2>/dev/null || true
 
 echo
 echo "==== RESULT: $PASS passed, $FAIL failed ===="
diff --git a/lib/gitflow.sh b/lib/gitflow.sh
index 445066b..59955b5 100644
--- a/lib/gitflow.sh
+++ b/lib/gitflow.sh
@@ -306,19 +306,24 @@ else
   echo "gitflow pre-commit: gitleaks not installed — secret scan skipped (https://github.com/gitleaks/gitleaks)." >&2
 fi
 
+# Per-repo opt-out of the branch model (a clone of a foreign project):
+#   git config gitflow.protect false
+[ "\$(git config --bool --default true gitflow.protect)" = false ] && exit 0
+
 case "\$br" in
   $GITFLOW_MAIN|$GITFLOW_DEVELOP) ;;                        # protected — keep checking
   *) exit 0 ;;                                              # working branch — allow
 esac
 
-# whitelist: all-staged-under-.claude/ (memory/doc/deploy helpers) — allow
-if [ -z "\$(git diff --cached --name-only | grep -v '^\.claude/' | head -1)" ]; then
+# whitelist: all-staged-under-.claude/ (memory/doc/deploy helpers) or
+# .githooks/ (the hooks themselves, refreshed by the lib) — allow
+if [ -z "\$(git diff --cached --name-only | grep -vE '^\.(claude|githooks)/' | head -1)" ]; then
   exit 0
 fi
 
 echo "gitflow pre-commit: BLOCKED — direct commit on '\$br'." >&2
 echo "  Branch from the right base (feature/bugfix->develop, hotfix->main), or merge." >&2
-echo "  (.claude/** memory commits are exempt; --no-verify bypasses locally.)" >&2
+echo "  (.claude/** and .githooks/** commits are exempt; foreign clone? git config gitflow.protect false)" >&2
 exit 1
 HOOK
 }
@@ -335,6 +340,8 @@ cat <<'HOOK'
 # holds. Never fails the commit: no origin / offline / refused → warning only.
 # Opt out for one command with GITFLOW_NO_PUSH=1 (throwaway repos, tests).
 [ "${GITFLOW_NO_PUSH:-0}" = 1 ] && exit 0
+# Per-repo opt-out (no push rights on a foreign clone): git config gitflow.autopush false
+[ "$(git config --bool --default true gitflow.autopush)" = false ] && exit 0
 git remote get-url origin >/dev/null 2>&1 || exit 0
 br=$(git symbolic-ref --short -q HEAD 2>/dev/null) || exit 0   # detached HEAD — nothing to track
 if command -v timeout >/dev/null 2>&1; then t="timeout ${GITFLOW_PUSH_TIMEOUT:-30}"; else t=""; fi
@@ -345,9 +352,18 @@ exit 0
 HOOK
 }
 
-# write the versioned hook files — does NOT activate (see gitflow_activate_hook).
+_gitflow_emit_hook() {             # <pre-commit|post-commit|post-merge>
+  case "$1" in
+    pre-commit) _gitflow_emit_pre_commit ;;
+    post-commit|post-merge) _gitflow_emit_push_hook "$1" ;;
+    *) return 2 ;;
+  esac
+}
+
+# write the versioned hook files into $1 (default .githooks) — does NOT
+# activate (see gitflow_activate_hook / gitflow_global_hooks).
 _gitflow_write_hook() {
-  local hd=".githooks"
+  local hd="${1:-.githooks}"
   mkdir -p "$hd"
   _gitflow_emit_pre_commit > "$hd/pre-commit"
   _gitflow_emit_push_hook post-commit > "$hd/post-commit"
@@ -366,6 +382,41 @@ gitflow_install_hook() {
   _gitflow_write_hook && gitflow_activate_hook
 }
 
+# gitflow_reconcile_hooks → refresh a repo's .githooks/ when it lags the lib
+# (LRN-114: a generator edit never reaches installed hooks by itself; the
+# session-start hook calls this once per session). Only for repos that opted
+# into the per-repo layout (.githooks/pre-commit present, or local
+# core.hooksPath = .githooks); others are covered by the global hooks dir.
+# Prints "gitflow hooks refreshed: <names>" when it wrote something, nothing
+# when current. Never fails the caller.
+gitflow_reconcile_hooks() {
+  local root hd name stale=""
+  root=$(git rev-parse --show-toplevel 2>/dev/null) || return 0
+  hd="$root/.githooks"
+  [ -f "$hd/pre-commit" ] \
+    || [ "$(git config --local core.hooksPath 2>/dev/null)" = ".githooks" ] \
+    || return 0
+  for name in pre-commit post-commit post-merge; do
+    diff -q <(_gitflow_emit_hook "$name") "$hd/$name" >/dev/null 2>&1 || stale="$stale $name"
+  done
+  [ -n "$stale" ] || return 0
+  (cd "$root" && gitflow_install_hook) || return 0
+  echo "gitflow hooks refreshed:$stale"
+}
+
+# gitflow_global_hooks <dir> [config-value] → write the three hooks into <dir>
+# and point git's GLOBAL core.hooksPath at it (value defaults to <dir>; link.sh
+# passes '~/.claude/githooks' so the setting is machine-agnostic). Every repo
+# on the machine is then protected and auto-pushed, whether or not it ever ran
+# gitflow init; a repo's own local core.hooksPath still wins, by git's rules.
+gitflow_global_hooks() {
+  local dir="${1:-}" value="${2:-${1:-}}"
+  [ -n "$dir" ] || { echo "gitflow_global_hooks: missing <dir>" >&2; return 2; }
+  _gitflow_write_hook "$dir" || return 1
+  [ "$(git config --global core.hooksPath 2>/dev/null)" = "$value" ] && return 0
+  git config --global core.hooksPath "$value"
+}
+
 # ── CLI dispatch (only when executed, not sourced) ───────────────────────────
 if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
   set -uo pipefail
@@ -381,11 +432,10 @@ if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
     reconcile)      gitflow_reconcile_gitignore "$@" ;;
     purge-transient) _gitflow_purge_transient ;;
     install-hook)   gitflow_install_hook "$@" ;;
-    emit-hook)      case "${1:-pre-commit}" in
-                      pre-commit)  _gitflow_emit_pre_commit ;;
-                      post-commit|post-merge) _gitflow_emit_push_hook "$1" ;;
-                      *) echo "gitflow.sh emit-hook {pre-commit|post-commit|post-merge}" >&2; exit 2 ;;
-                    esac ;;
-    *) echo "usage: gitflow.sh {type|protected-base|base-for|release-open|start|finish|init|reconcile|purge-transient|install-hook|emit-hook [pre-commit|post-commit|post-merge]}" >&2; exit 2 ;;
+    reconcile-hooks) gitflow_reconcile_hooks ;;
+    global-hooks)   gitflow_global_hooks "$@" ;;
+    emit-hook)      _gitflow_emit_hook "${1:-pre-commit}" \
+                      || { echo "gitflow.sh emit-hook {pre-commit|post-commit|post-merge}" >&2; exit 2; } ;;
+    *) echo "usage: gitflow.sh {type|protected-base|base-for|release-open|start|finish|init|reconcile|purge-transient|install-hook|reconcile-hooks|global-hooks <dir> [value]|emit-hook [pre-commit|post-commit|post-merge]}" >&2; exit 2 ;;
   esac
 fi
diff --git a/lib/tests/run-doc-commit.sh b/lib/tests/run-doc-commit.sh
index f337d9c..5d16d22 100755
--- a/lib/tests/run-doc-commit.sh
+++ b/lib/tests/run-doc-commit.sh
@@ -18,6 +18,8 @@
 #
 # No -e: run every test and report, even after a failure.
 set -uo pipefail
+# Hermetic git: the global hooks dir (BDR-095) must not fire in throwaway repos.
+export GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_SYSTEM=/dev/null
 
 HERE="$(cd -P "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 HELPER="$HERE/../doc-commit.sh"
diff --git a/lib/tests/run-release-candidate.sh b/lib/tests/run-release-candidate.sh
index 8875016..3bfe4ae 100644
--- a/lib/tests/run-release-candidate.sh
+++ b/lib/tests/run-release-candidate.sh
@@ -9,6 +9,8 @@
 #                  assertion REDS, proving gitflow fans out main+develop but never tags.
 # GREEN(RC_TAG=1): the skill's flow adds `git tag` → tag present on main's merge commit.
 set -uo pipefail
+# Hermetic git: the global hooks dir (BDR-095) must not fire in throwaway repos.
+export GIT_CONFIG_GLOBAL=/dev/null GIT_CONFIG_SYSTEM=/dev/null
 
 GREP=/usr/bin/grep                                              # LRN-074: pin grep
 LIBDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"       # repo lib/
diff --git a/link.sh b/link.sh
index ec942ff..d260640 100644
--- a/link.sh
+++ b/link.sh
@@ -20,7 +20,26 @@ link_file() {
 link_file "$REPO/CLAUDE.global.md" "$CLAUDE/CLAUDE.md"
 link_file "$REPO/settings.json" "$CLAUDE/settings.json"
 
-for item in hooks agents skills lib templates rules; do
+# Global git hooks (BDR-095): githooks/ is generated from lib/gitflow.sh so it
+# never drifts from the per-repo .githooks/ the lib writes, and git's GLOBAL
+# core.hooksPath points at ~/.claude/githooks → every repo on this machine is
+# protected and auto-pushed, even one that never ran gitflow init. A repo's
+# own local core.hooksPath still wins (git precedence), which is what the
+# session-start reconcile is for.
+# The tilde is stored literally on purpose: git expands `~` in core.hooksPath
+# itself, so the setting stays valid on any machine and for any HOME.
+# shellcheck disable=SC2088
+_gh_before=$(git config --global core.hooksPath 2>/dev/null || true)
+# shellcheck disable=SC2088
+bash "$REPO/lib/gitflow.sh" global-hooks "$REPO/githooks" '~/.claude/githooks'
+# shellcheck disable=SC2088
+if [ "$_gh_before" != '~/.claude/githooks' ]; then
+  echo "🪝 git config --global core.hooksPath ~/.claude/githooks (was: ${_gh_before:-unset})"
+  CHANGED=$((CHANGED + 1))
+fi
+unset _gh_before
+
+for item in hooks githooks agents skills lib templates rules; do
   target="$CLAUDE/$item"
   if [ -L "$target" ]; then
     if [ "$(readlink "$target")" = "$REPO/$item" ]; then
diff --git a/settings.json b/settings.json
index 2c577cb..d9b984f 100644
--- a/settings.json
+++ b/settings.json
@@ -292,7 +292,17 @@
       "Bash(* | sh)",
       "Bash(* | sh -*)",
       "Bash(* | sudo *)",
-      "Bash(chattr *)"
+      "Bash(chattr *)",
+      "Bash(GIT_CONFIG_GLOBAL=*)",
+      "Bash(GIT_CONFIG_SYSTEM=*)",
+      "Bash(GIT_CONFIG=*)",
+      "Bash(env GIT_CONFIG*)",
+      "Bash(git config --unset core.hooksPath*)",
+      "Bash(git config --unset-all core.hooksPath*)",
+      "Bash(git config --local core.hooksPath *)",
+      "Bash(git config gitflow.*)",
+      "Bash(git config --global gitflow.*)",
+      "Bash(git config --local gitflow.*)"
     ],
     "ask": [
       "Bash(bash -c *)",
diff --git a/templates/settings/SETTINGS.md b/templates/settings/SETTINGS.md
index c062174..335303b 100644
--- a/templates/settings/SETTINGS.md
+++ b/templates/settings/SETTINGS.md
@@ -152,10 +152,16 @@ is not shipped yet (BLK-022).
 
 Push discipline lives in `lib/gitflow.sh`: `start` pushes the branch,
 `finish` pushes each merge target, and the post-commit / post-merge hooks
-written by `gitflow init` / `install-hook` push every commit as it lands
-(warn, never block, on failure; `GITFLOW_NO_PUSH=1` for throwaway repos).
-`hooks/unpushed-guard.sh` reports a branch ahead of its upstream at session
-start and at each turn end.
+push every commit as it lands (warn, never block, on failure). The hooks
+reach every repo two ways: `make link` generates `githooks/` from the lib
+and sets git's global `core.hooksPath` to `~/.claude/githooks` (a repo's own
+local `core.hooksPath` wins, by git's rules), and `hooks/session-start.sh`
+refreshes a repo's `.githooks/` when it lags the lib. Per-repo opt-outs for
+a foreign clone: `git config gitflow.protect false` (branch model) and
+`git config gitflow.autopush false` (push); `GITFLOW_NO_PUSH=1` for one
+command in a throwaway repo. `make doctor` checks the global setting and
+the generated dir. `hooks/unpushed-guard.sh` reports a branch ahead of its
+upstream at session start and at each turn end.
 
 ## managed-settings.json (enterprise)