chore(caveman): purge plugin + always-on integration

Disable + uninstall caveman@caveman and delete every repo dependency on
it: SessionStart/UserPromptSubmit hook blocks, standalone hook files,
settings.json enabledPlugins + marketplace entries, install-plugins.sh
STEP 5.5, update-all.sh refresh step, plugins.lock.json entry, doctor.sh
checks, lib/detect-plugins.sh helpers, lib/profile.sh + plugin-advisor +
skills/profile protected-list entries, .gitignore runtime-file block,
and README/USAGE docs. Dead /caveman:compress refs replaced with
manual/claude.ai guidance. Memory-registry terse-format convention kept
(separate subsystem). Version 3.4.0 -> 3.5.0.

On a subscription plan caveman's ~75% output-token compression has no
cost benefit, and the always-on hooks added friction on validation
gates and client deliverables.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X3e8LaH2vymmxyh36h3jFU

update-all.sh

@@ -271,36 +271,6 @@ else
   info "design-motion-principles not installed — skipping"
 fi
 
-# ── 7.4. Update Caveman (hooks + MCP shrink) ──
-# Plugin updates are handled by the marketplace plugin update loop below
-# (step 8). This step refreshes the standalone hook files (statusline +
-# stats badge) that live outside the plugin in ~/.claude/hooks/.
-echo ""
-echo "── Updating Caveman extras (hooks + MCP shrink)..."
-if [ -f "$HOME/.claude/hooks/caveman-statusline.sh" ]; then
-  CAVEMAN_HOOKS_URL="https://raw.githubusercontent.com/JuliusBrussee/caveman/main/hooks/install.sh"
-  CAVEMAN_HOOKS_TMP="$(mktemp -t caveman-hooks-XXXXXX.sh)"
-  if curl -fsSL "$CAVEMAN_HOOKS_URL" -o "$CAVEMAN_HOOKS_TMP" \
-     && bash "$CAVEMAN_HOOKS_TMP" --force 2>/dev/null; then
-    ok "Caveman hooks refreshed"
-  else
-    warn "Caveman hooks refresh failed — re-run install-plugins.sh"
-  fi
-  rm -f "$CAVEMAN_HOOKS_TMP"
-else
-  info "Caveman hooks not installed — skipping (run: make plugin)"
-fi
-# MCP shrink uses 'npx -y caveman-shrink' which always fetches latest from
-# npm at invocation time — no explicit update needed. We only check for
-# user-defined wrappers (caveman-shrink-*), since the bare proxy fails
-# health checks without an upstream.
-if command -v claude &>/dev/null \
-   && claude mcp list 2>/dev/null | grep -q '^caveman-shrink-'; then
-  ok "caveman-shrink wrappers detected (auto-update via npx -y)"
-else
-  info "caveman-shrink not wrapped — manual setup (see install-plugins.sh STEP 5.5)"
-fi
-
 # ── 7.5. Update external skills (npx skills) ──
 echo ""
 echo "── Updating external skills (npx skills)..."