feat: initialize standalone agent-workflow

.husky/commit-msg

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+#!/usr/bin/env sh
+# Final commit-msg stage (manual_ai_mode: off in .ai-commit.yaml — no AI-NONE footer).
+set -e
+command -v ai-commit >/dev/null 2>&1 || exit 0
+exec ai-commit commit-msg "$1"

.husky/pre-commit

@@ -0,0 +1,5 @@
+#!/usr/bin/env sh
+# Optional: preview AI message before commit (skipped in non-interactive / CI).
+set -e
+command -v ai-commit >/dev/null 2>&1 || exit 0
+exec ai-commit preview

.husky/prepare-commit-msg

@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+# Fill commit message via ai-commit when using interactive git commit / placeholders.
+# Requires ai-commit on PATH and .ai-commit.yaml in repo root. Silent skip if missing.
+set -e
+command -v ai-commit >/dev/null 2>&1 || exit 0
+exec ai-commit hook "$1" "$2" "${3:-}"