CONFIGURED - Enforce VERB-style commit subjects via commit-msg hook

Add a commit-msg git hook that rejects any subject not matching
"VERB - Description" (ALL-CAPS verb + " - " + description), letting
merge/revert/fixup commits through. Document the mandatory style and the
no-attribution rule in CLAUDE.md, and note that .githooks is activated per
clone with core.hooksPath. Prevents the prefix-less commits agents kept
producing.

.githooks/commit-msg

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+#
+# commit-msg: enforce the project's commit subject style.
+#
+# The subject (first line) MUST be:   VERB - Short description
+#   - VERB : an ALL-CAPS verb, >= 3 letters
+#            (e.g. ADDED, FIXED, STYLED, DOCUMENTED, CLEANED, REVERTED,
+#             CONFIGURED, IMPROVED, POLISHED, REMOVED, RENAMED, REFACTORED)
+#   - then " - " (space hyphen space)
+#   - then a description (capitalized, imperative, no trailing period).
+#
+# Good:
+#   FIXED - Load .env in drizzle.config so drizzle-kit targets the right DB
+#   STYLED - Turn the admin portfolio overview into a professional table
+#
+# Bad (rejected):
+#   Flatten portfolio category routes to /portfolio/[slug]   (no VERB prefix)
+#   feat(hero): add ambient backdrop                          (wrong style)
+#
+# Install once:   git config core.hooksPath .githooks
+# Emergency skip: git commit --no-verify
+#
+set -euo pipefail
+
+msg_file="$1"
+
+# First non-empty, non-comment line = the subject.
+subject="$(grep -vE '^[[:space:]]*#' "$msg_file" | grep -vE '^[[:space:]]*$' | head -n1 || true)"
+
+# Let git's own housekeeping commits through untouched.
+case "$subject" in
+  Merge\ * | Revert\ * | fixup!\ * | squash!\ *) exit 0 ;;
+esac
+
+pattern='^[A-Z]{3,} - .+'
+if [[ ! "$subject" =~ $pattern ]]; then
+  cat >&2 <<EOF
+
+✗ commit rejected: subject does not match the project style.
+
+  Required:  VERB - Short description
+  Example:   FIXED - Load .env so drizzle-kit targets the right DB
+
+  Your subject was:
+    ${subject:-(empty)}
+
+  VERB must be ALL-CAPS (>= 3 letters), then " - ", then the description.
+  (Emergency skip: git commit --no-verify)
+
+EOF
+  exit 1
+fi