phase 9.1-9.2: add commit-msg hook + consolidate tool docs

Adds the commit-msg hook promised in HOOKS.md since Round 5.
The hook auto-prepends the current Red Bear development phase
(e.g. 'phase 8.4:') to commit messages. The phase is detected
from the most recent 'phase X.Y:' commit in the git log.

Hook behavior:
  - Normal commit    → prepended: 'phase 8.4: my message'
  - Already has prefix → skipped
  - Revert message   → skipped
  - Empty/comment    → skipped

Install: cp local/scripts/commit-msg .git/hooks/commit-msg && chmod +x

Updates HOOKS.md with:
  - commit-msg hook documentation (install, behavior)
  - Full tool inventory table (10 tools across 9+ rounds)
    listing each tool's type, purpose, and modes/flags

local/scripts/commit-msg

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# commit-msg — Optional commit-msg hook for Red Bear OS.
+# Auto-prepends the current development phase to commit messages.
+# Usage:
+#   cp local/scripts/commit-msg .git/hooks/commit-msg
+#   chmod +x .git/hooks/commit-msg
+# The hook is OPT-IN. See local/docs/HOOKS.md.
+
+set -euo pipefail
+
+COMMIT_MSG_FILE="$1"
+PHASE=""
+
+# Detect current phase from the most recent "phase X.Y:" commit in log
+detect_phase() {
+    PHASE=$(git log --oneline -50 2>/dev/null | grep -oP 'phase \d+\.\d+' | head -1)
+    [ -n "$PHASE" ] || PHASE="phase"
+}
+
+detect_phase
+FIRST_LINE=$(head -1 "$COMMIT_MSG_FILE" 2>/dev/null)
+
+# Already has phase prefix or is Revert — skip
+echo "$FIRST_LINE" | grep -qE '^(phase [0-9]+\.[0-9]+):' && exit 0
+echo "$FIRST_LINE" | grep -qE '^Revert ' && exit 0
+
+# Empty or comment — skip
+[ -z "$FIRST_LINE" ] && exit 0
+echo "$FIRST_LINE" | grep -q '^#' && exit 0
+
+# Prepend phase
+sed -i "1s/^/${PHASE}: /" "$COMMIT_MSG_FILE"
+exit 0