diff --git a/.git-management.json b/.git-management.json
new file mode 100644
index 0000000..e13386a
--- /dev/null
+++ b/.git-management.json
@@ -0,0 +1,16 @@
+{
+  "policy_version": 3,
+  "default_branch": "main",
+  "branch_pattern": "^(ai|feat|fix|refactor|chore)/.+$",
+  "required_pr_metadata": ["task_id", "run_id"],
+  "task_id_pattern": "^[A-Z][A-Z0-9]*-[0-9]+$",
+  "require_task_id_in_pr_title": true,
+  "required_checks": ["ci", "git-governance"],
+  "review_policy": {
+    "enabled": false,
+    "required_approvals": 0,
+    "require_resolved_conversations": false
+  },
+  "require_up_to_date_branch": true,
+  "merge_method": "squash"
+}
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..ee7fe2c
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,19 @@
+<!-- multica
+task_id: <必填任务标识>
+run_id: <必填运行标识>
+change_id: <可选变更标识>
+-->
+
+<!-- PR 标题必须包含与上方 task_id 完全相同的完整任务号。 -->
+
+## 目标
+
+## 变更范围
+
+## 验收标准
+
+- [ ]
+
+## 测试结果
+
+## 风险和回滚
diff --git a/.github/scripts/test_validate_pr.py b/.github/scripts/test_validate_pr.py
new file mode 100644
index 0000000..c2a2fe3
--- /dev/null
+++ b/.github/scripts/test_validate_pr.py
@@ -0,0 +1,83 @@
+import importlib.util
+import unittest
+from pathlib import Path
+
+
+MODULE_PATH = Path(__file__).with_name("validate_pr.py")
+SPEC = importlib.util.spec_from_file_location("validate_pr", MODULE_PATH)
+VALIDATE_PR = importlib.util.module_from_spec(SPEC)
+SPEC.loader.exec_module(VALIDATE_PR)
+
+POLICY = {
+    "default_branch": "main",
+    "branch_pattern": r"^(ai|feat|fix|refactor|chore)/.+$",
+    "required_pr_metadata": ["task_id", "run_id"],
+    "task_id_pattern": r"^[A-Z][A-Z0-9]*-[0-9]+$",
+    "require_task_id_in_pr_title": True,
+}
+
+
+class ValidatePullRequestTest(unittest.TestCase):
+    def test_accepts_valid_pull_request(self):
+        event = {
+            "pull_request": {
+                "title": "feat(example): MT-1 add example",
+                "body": "<!-- multica\ntask_id: MT-1\nrun_id: RUN-1\n-->",
+                "head": {"ref": "feat/example"},
+                "base": {"ref": "main"},
+            }
+        }
+        self.assertEqual([], VALIDATE_PR.validate(event, POLICY))
+
+    def test_rejects_missing_metadata_and_invalid_branch(self):
+        event = {
+            "pull_request": {
+                "body": "",
+                "head": {"ref": "random"},
+                "base": {"ref": "main"},
+            }
+        }
+        failures = VALIDATE_PR.validate(event, POLICY)
+        self.assertIn("branch name does not match policy: random", failures)
+        self.assertIn("missing PR metadata: task_id", failures)
+        self.assertIn("missing PR metadata: run_id", failures)
+
+    def test_rejects_title_without_task_id(self):
+        event = {
+            "pull_request": {
+                "title": "feat(home): add team homepage",
+                "body": "<!-- multica\ntask_id: TML-741\nrun_id: RUN-1\n-->",
+                "head": {"ref": "feat/home"},
+                "base": {"ref": "main"},
+            }
+        }
+        failures = VALIDATE_PR.validate(event, POLICY)
+        self.assertIn("PR title must contain task_id: TML-741", failures)
+
+    def test_rejects_title_with_different_task_id(self):
+        event = {
+            "pull_request": {
+                "title": "feat(home): TML-742 add team homepage",
+                "body": "<!-- multica\ntask_id: TML-741\nrun_id: RUN-1\n-->",
+                "head": {"ref": "feat/home"},
+                "base": {"ref": "main"},
+            }
+        }
+        failures = VALIDATE_PR.validate(event, POLICY)
+        self.assertIn("PR title must contain task_id: TML-741", failures)
+
+    def test_rejects_task_id_prefix_match(self):
+        event = {
+            "pull_request": {
+                "title": "feat(home): TML-7410 add team homepage",
+                "body": "<!-- multica\ntask_id: TML-741\nrun_id: RUN-1\n-->",
+                "head": {"ref": "feat/home"},
+                "base": {"ref": "main"},
+            }
+        }
+        failures = VALIDATE_PR.validate(event, POLICY)
+        self.assertIn("PR title must contain task_id: TML-741", failures)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/.github/scripts/validate_pr.py b/.github/scripts/validate_pr.py
new file mode 100644
index 0000000..9252e88
--- /dev/null
+++ b/.github/scripts/validate_pr.py
@@ -0,0 +1,82 @@
+import argparse
+import json
+import re
+from pathlib import Path
+
+
+def parse_metadata(body):
+    block = re.search(r"<!--\s*multica(.*?)-->", body or "", re.S | re.I)
+    if not block:
+        raise ValueError("PR must contain a multica metadata block")
+
+    fields = {}
+    for line in block.group(1).splitlines():
+        if ":" in line:
+            key, value = line.split(":", 1)
+            fields[key.strip()] = value.strip()
+    return fields
+
+
+def validate(event, policy):
+    pull_request = event.get("pull_request") or {}
+    title = pull_request.get("title") or ""
+    body = pull_request.get("body") or ""
+    head_ref = pull_request.get("head", {}).get("ref") or ""
+    base_ref = pull_request.get("base", {}).get("ref") or ""
+    failures = []
+
+    if base_ref != policy["default_branch"]:
+        failures.append(
+            f"target branch must be {policy['default_branch']}, got {base_ref or '<empty>'}"
+        )
+
+    if not re.fullmatch(policy["branch_pattern"], head_ref):
+        failures.append(f"branch name does not match policy: {head_ref or '<empty>'}")
+
+    try:
+        metadata = parse_metadata(body)
+    except ValueError as exc:
+        failures.append(str(exc))
+        metadata = {}
+
+    for field in policy.get("required_pr_metadata", []):
+        value = metadata.get(field, "")
+        if not value or value.startswith("<"):
+            failures.append(f"missing PR metadata: {field}")
+
+    task_id = metadata.get("task_id", "")
+    task_id_is_present = bool(task_id) and not task_id.startswith("<")
+    task_id_is_valid = task_id_is_present
+    task_id_pattern = policy.get("task_id_pattern")
+    if task_id_is_present and task_id_pattern and not re.fullmatch(task_id_pattern, task_id):
+        failures.append(f"invalid PR metadata: task_id: {task_id}")
+        task_id_is_valid = False
+
+    if policy.get("require_task_id_in_pr_title") and task_id_is_valid:
+        exact_task_id = rf"(?<![A-Za-z0-9]){re.escape(task_id)}(?![A-Za-z0-9])"
+        if not re.search(exact_task_id, title):
+            failures.append(f"PR title must contain task_id: {task_id}")
+
+    return failures
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--event", required=True)
+    parser.add_argument("--policy", required=True)
+    args = parser.parse_args()
+
+    event = json.loads(Path(args.event).read_text(encoding="utf-8"))
+    policy = json.loads(Path(args.policy).read_text(encoding="utf-8"))
+    failures = validate(event, policy)
+
+    if failures:
+        for failure in failures:
+            print(f"FAILED: {failure}")
+        raise SystemExit(1)
+
+    print("Git governance policy passed")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..9074d4e
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,69 @@
+name: ci
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  ci:
+    name: ci
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        if: hashFiles('go.mod') != ''
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Setup Node
+        if: hashFiles('package.json') != '' && hashFiles('bun.lockb') == '' && hashFiles('bun.lock') == ''
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+
+      - name: Setup Bun
+        if: hashFiles('bun.lockb') != '' || hashFiles('bun.lock') != ''
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Run project checks
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          if [[ -f Makefile ]] && grep -qE '^ci:' Makefile; then
+            make ci
+            exit 0
+          fi
+
+          if [[ -f go.mod ]]; then
+            go test ./...
+            exit 0
+          fi
+
+          if [[ -f package.json ]]; then
+            if [[ -f bun.lockb || -f bun.lock ]]; then
+              bun install --frozen-lockfile
+              if node -e 'const p=require("./package.json"); process.exit(p.scripts && p.scripts.build ? 0 : 1)'; then
+                bun run build
+              fi
+            else
+              npm ci
+              if node -e 'const p=require("./package.json"); process.exit(p.scripts && p.scripts.build ? 0 : 1)'; then
+                npm run build
+              fi
+            fi
+            exit 0
+          fi
+
+          echo "No standard project command detected. Add a Makefile ci target or update this workflow."
diff --git a/.github/workflows/pr-policy.yml b/.github/workflows/pr-policy.yml
new file mode 100644
index 0000000..80f68ad
--- /dev/null
+++ b/.github/workflows/pr-policy.yml
@@ -0,0 +1,30 @@
+name: git-governance
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  governance:
+    name: git-governance
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          ref: main
+
+      - name: Test policy validator
+        run: python -m unittest discover -s .github/scripts -p "test_*.py"
+
+      - name: Validate pull request
+        shell: bash
+        run: |
+          python .github/scripts/validate_pr.py \
+            --event "$GITHUB_EVENT_PATH" \
+            --policy .git-management.json