feat(gitflow): auto-purge transient superpowers artifacts at finish (BDR-065)

_gitflow_purge_transient removes docs/superpowers/{specs,plans} on the
feature/bugfix branch just before the directed merge, so develop's tip
lands clean while the feature commits stay reachable as the archive
(git show <sha>:...). Best-effort: never aborts a finish (no-op when
absent, skip on dirty paths, restore index+tree on commit failure).
Opt-out GITFLOW_PURGE_TRANSIENT=0; purge-transient CLI verb. Automates
the manual post-merge cleanup BDR-065 left as doctrine (slipped once,
655e364). Universal via the ~/.claude/lib symlink. gitflow-test T17 a-d;
shellcheck clean; make test exit 0.

CLAUDE.md

@@ -32,8 +32,13 @@ or re-run `make plugin`.
 
 `docs/superpowers/specs/**` and `docs/superpowers/plans/**` are run-time
 artifacts of a feature pipeline (subagent briefs, reviewer references).
-They are committed DURING the run and DELETED in the post-merge cleanup
+They are committed DURING the run (the SDD worktree + reviewers read them
-(BDR-065) — git history at the feature commits is their archive. Durable
+from disk — NOT gitignored), then AUTO-PURGED by `gitflow finish` on a
-knowledge goes to `.claude/memory/` registries, never to these files.
+`feature`/`bugfix` branch, before the merge, so develop's tip stays clean
-Derived scan/audit outputs (`.audit/**`) are gitignored and never
+(BDR-065, `lib/gitflow.sh` `_gitflow_purge_transient`). The feature commits
-committed, even redacted (LRN-124).
+stay reachable from develop, so `git show <sha>:docs/…` is still the archive.
+Opt out with `GITFLOW_PURGE_TRANSIENT=0`. NOT in scope: `.claude/tasks/{contracts,plans}`
+(durable, versioned, referenced by decisions.md). Durable knowledge goes to
+`.claude/memory/` registries, never to these files. Derived scan/audit
+outputs (`.audit/**`) are gitignored and never committed, even redacted
+(LRN-124).

lib/gitflow-test.sh

@@ -239,6 +239,7 @@ gitflow_start feature glwork >/dev/null 2>&1
 # proving this backstop is NOT gated by the branch-protection check above it)
 printf 'aws_access_key_id = AKIA%s\n' "GDR5XRBXYARW2I5N" > secret.txt
 git add secret.txt
+# shellcheck disable=SC2034  # gl_out is used in the deferred chk eval strings
 gl_out="$(git commit -q -m "add secret" 2>&1)"; gl_rc=$?
 chk "T16a fake secret on feature branch → blocked" "[ $gl_rc -ne 0 ]"
 chk "T16a message mentions gitleaks"               'printf "%s" "$gl_out" | grep -qi gitleaks'
@@ -252,10 +253,57 @@ chk "T16b clean commit still succeeds" 'git commit -q -m "clean work" 2>/dev/nul
 # T16c — gitleaks missing from PATH → warn, never block (defense in depth
 # must not become a new single point of failure)
 echo clean2 > clean2.txt; git add clean2.txt
+# shellcheck disable=SC2034  # noleaks_out is used in the deferred chk eval strings
 noleaks_out="$(PATH=/usr/bin:/bin git commit -q -m "clean work 2" 2>&1)"; noleaks_rc=$?
 chk "T16c missing-gitleaks → still commits (rc0)" "[ $noleaks_rc -eq 0 ]"
 chk "T16c missing-gitleaks → warns"    'printf "%s" "$noleaks_out" | grep -qi "not installed"'
 
+echo "T17 — finish auto-purges transient superpowers artifacts (BDR-065)"
+# T17a — feature carrying docs/superpowers spec+plan: purged before merge,
+# develop TIP clean, artifacts still recoverable from history (archive property)
+newrepo purgefeat; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+gitflow_start feature pf >/dev/null 2>&1
+mkdir -p docs/superpowers/specs docs/superpowers/plans
+echo spec > docs/superpowers/specs/s.md
+echo plan > docs/superpowers/plans/p.md
+echo code > feat.txt
+git add -A; git commit -q -m "feat + transient spec/plan"
+gitflow_finish >/dev/null 2>&1
+# the add-commit stays reachable from develop via the --no-ff merge's 2nd parent;
+# --full-history defeats the path simplification that hides it, and `git show
+# <sha>:path` proves BDR-065's "git history = the archive" recovery.
+# shellcheck disable=SC2034  # pf_add_sha is used in the deferred chk eval string
+pf_add_sha="$(git log develop --full-history --format=%H -- docs/superpowers/specs/s.md | tail -1)"
+chk "T17a merged into develop"           'git log develop --oneline | grep -q "Merge feature/pf into develop"'
+chk "T17a develop TIP has no transient"  '[ -z "$(git ls-tree -r develop --name-only -- docs/superpowers)" ]'
+chk "T17a purge commit on record"        'git log develop --oneline | grep -q "purge transient planning artifacts"'
+chk "T17a artifact recoverable from history" '[ "$(git show "$pf_add_sha":docs/superpowers/specs/s.md 2>/dev/null)" = spec ]'
+chk "T17a non-transient code survives"   'git ls-tree -r develop --name-only | grep -qx feat.txt'
+chk "T17a feature branch deleted"        '! git rev-parse --verify -q refs/heads/feature/pf >/dev/null'
+
+# T17b — no artifacts → purge is a silent no-op, no spurious commit
+newrepo purgenone; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+gitflow_start feature pn >/dev/null 2>&1; echo w>w.txt; git add w.txt; git commit -q -m w
+gitflow_finish >/dev/null 2>&1
+chk "T17b merged into develop"     'git log develop --oneline | grep -q "Merge feature/pn into develop"'
+chk "T17b no purge commit created" '! git log develop --oneline | grep -q "purge transient"'
+
+# T17c — opt-out (GITFLOW_PURGE_TRANSIENT=0) keeps the artifacts on develop
+newrepo purgeoff; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+gitflow_start feature po >/dev/null 2>&1
+mkdir -p docs/superpowers/specs; echo spec > docs/superpowers/specs/s.md
+git add -A; git commit -q -m "feat + spec"
+GITFLOW_PURGE_TRANSIENT=0 gitflow_finish >/dev/null 2>&1
+chk "T17c opt-out keeps transient on develop TIP" '[ -n "$(git ls-tree -r develop --name-only -- docs/superpowers)" ]'
+
+# T17d — chore is OUT of purge scope (only feature/bugfix originate artifacts)
+newrepo purgechore; echo a>a; hookon; gitflow_init >/dev/null 2>&1
+gitflow_start chore pc >/dev/null 2>&1
+mkdir -p docs/superpowers/specs; echo spec > docs/superpowers/specs/s.md
+git add -A; git commit -q -m "chore + spec"
+gitflow_finish >/dev/null 2>&1
+chk "T17d chore leaves transient (not in scope)" '[ -n "$(git ls-tree -r develop --name-only -- docs/superpowers)" ]'
+
 echo
 echo "==== RESULT: $PASS passed, $FAIL failed ===="
 [ "$FAIL" -eq 0 ]

lib/gitflow.sh

@@ -18,6 +18,12 @@ GITFLOW_MAIN="main"
 GITFLOW_DEVELOP="develop"
 # template resolved relative to the lib; overridable for tests.
 GITFLOW_GITIGNORE_TEMPLATE="${GITFLOW_GITIGNORE_TEMPLATE:-$_GITFLOW_LIB_DIR/../templates/gitignore/standard.gitignore}"
+# Transient planning artifacts (superpowers spec/plan). A feature/bugfix run
+# COMMITS them (SDD worktree + reviewers read them from disk); finish PURGES
+# them before the merge reaches develop's tip (BDR-065). Fixed path list;
+# read GITFLOW_PURGE_TRANSIENT=0 at finish time to opt out (read in the helper,
+# never cached here, so an inline `VAR=0 gitflow_finish` override works).
+GITFLOW_TRANSIENT_PATHS=("docs/superpowers/specs" "docs/superpowers/plans")
 
 # ── predicates / pure helpers ────────────────────────────────────────────────
 
@@ -97,6 +103,42 @@ _gitflow_delete() {                # <branch>
   git branch -q -d "$br" || { echo "gitflow: '$br' not fully merged — branch kept" >&2; return 5; }
 }
 
+# _gitflow_purge_transient → remove the committed transient planning artifacts
+# (BDR-065) from the CURRENT branch just before the directed merge. Result: the
+# removal rides the feature/bugfix branch, whose earlier commits stay reachable
+# from develop through the --no-ff merge (`git show <sha>:…` = the archive),
+# while develop's TIP lands clean. Automates the manual post-merge chore that
+# BDR-065 left as doctrine (and that slipped once — commit 655e364).
+#
+# BEST-EFFORT BY CONTRACT: this NEVER aborts a finish. Nothing tracked → no-op;
+# uncommitted changes under those paths, or a failed commit → warn + degrade to
+# the old manual-cleanup behaviour, index/tree restored, merge still proceeds.
+# The scoped commit (`-- <paths>`) records only the deletions, so a dirty index
+# is never swept in. Opt out with GITFLOW_PURGE_TRANSIENT=0.
+_gitflow_purge_transient() {
+  [ "${GITFLOW_PURGE_TRANSIENT:-1}" = 1 ] || return 0
+  local p; local -a tracked=()
+  for p in "${GITFLOW_TRANSIENT_PATHS[@]}"; do
+    [ -n "$(git ls-files -- "$p")" ] && tracked+=("$p")
+  done
+  [ "${#tracked[@]}" -gt 0 ] || return 0             # nothing tracked → no-op
+  # only purge paths with no pending changes → git rm is all-or-nothing safe and
+  # never discards uncommitted work under docs/superpowers.
+  if ! git diff --quiet HEAD -- "${tracked[@]}" 2>/dev/null; then
+    echo "gitflow: transient artifacts have uncommitted changes — purge skipped, finishing without it (clean up by hand)" >&2
+    return 0
+  fi
+  if git rm -r -q -- "${tracked[@]}" >/dev/null 2>&1 \
+     && git commit -q -m "chore: purge transient planning artifacts (BDR-065)" -- "${tracked[@]}"; then
+    echo "gitflow: purged transient planning artifacts before merge (${tracked[*]})" >&2
+  else
+    echo "gitflow: transient-artifact purge failed — finishing without it (clean up by hand)" >&2
+    git reset -q HEAD -- "${tracked[@]}" 2>/dev/null || true   # unstage any partial rm
+    git checkout -q -- "${tracked[@]}" 2>/dev/null || true     # restore working tree
+  fi
+  return 0
+}
+
 # gitflow_finish [<type> <name>] → directed merge of the CURRENT branch per its
 # type, then delete. WHEN to call this is the human gate (SKILL.md).
 #
@@ -117,7 +159,10 @@ gitflow_finish() {
   fi
   type="$(gitflow_branch_type "$br")"
   case "$type" in
-    feature|bugfix|chore)
+    feature|bugfix)
+      _gitflow_purge_transient   # BDR-065 auto-cleanup, on HEAD, pre-merge; never blocks
+      _gitflow_merge_into "$GITFLOW_DEVELOP" "$br" && _gitflow_delete "$br" ;;
+    chore)
       _gitflow_merge_into "$GITFLOW_DEVELOP" "$br" && _gitflow_delete "$br" ;;
     release)
       _gitflow_merge_into "$GITFLOW_MAIN" "$br" \
@@ -283,8 +328,9 @@ if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
     finish)         gitflow_finish "$@" ;;
     init)           gitflow_init "$@" ;;
     reconcile)      gitflow_reconcile_gitignore "$@" ;;
+    purge-transient) _gitflow_purge_transient ;;
     install-hook)   gitflow_install_hook "$@" ;;
     emit-hook)      _gitflow_emit_pre_commit ;;
-    *) echo "usage: gitflow.sh {type|protected-base|base-for|release-open|start|finish|init|reconcile|install-hook|emit-hook}" >&2; exit 2 ;;
+    *) echo "usage: gitflow.sh {type|protected-base|base-for|release-open|start|finish|init|reconcile|purge-transient|install-hook|emit-hook}" >&2; exit 2 ;;
   esac
 fi