feat: initial commit — Billo Release Agent (LangGraph)

LangGraph-based release automation agent with:
- PR discovery (webhook + polling)
- AI code review via Claude Code CLI (subscription-based)
- Auto-create Jira tickets for PRs without ticket ID
- Jira ticket lifecycle management (code review -> staging -> done)
- CI/CD pipeline trigger, polling, and approval gates
- Slack interactive messages with approval buttons
- Per-repo semantic versioning
- PostgreSQL persistence (threads, staging, releases)
- FastAPI API (webhooks, approvals, status, manual triggers)
- Docker Compose deployment

1069 tests, 95%+ coverage.

tests/tools/fixtures/azdo_approve_release.json

@@ -0,0 +1,9 @@
+{
+  "id": "approval-uuid-123",
+  "status": "approved",
+  "approver": {
+    "id": "user-uuid-456",
+    "displayName": "Release Bot"
+  },
+  "comments": "Approved via release agent"
+}

tests/tools/fixtures/azdo_build_status.json

@@ -0,0 +1,9 @@
+{
+  "id": 1001,
+  "buildNumber": "20240115.1",
+  "status": "completed",
+  "result": "succeeded",
+  "queueTime": "2024-01-15T10:00:00Z",
+  "startTime": "2024-01-15T10:01:00Z",
+  "finishTime": "2024-01-15T10:10:00Z"
+}

tests/tools/fixtures/azdo_create_pr.json

@@ -0,0 +1,8 @@
+{
+  "pullRequestId": 99,
+  "title": "Release v1.2.0",
+  "status": "active",
+  "sourceRefName": "refs/heads/release/v1.2.0",
+  "targetRefName": "refs/heads/main",
+  "url": "https://dev.azure.com/my-org/my-project/_apis/git/repositories/my-repo/pullRequests/99"
+}

tests/tools/fixtures/azdo_merge_pr.json

@@ -0,0 +1,8 @@
+{
+  "pullRequestId": 42,
+  "status": "completed",
+  "title": "Fix the auth bug",
+  "completionOptions": {
+    "mergeStrategy": "squash"
+  }
+}

tests/tools/fixtures/azdo_pipelines.json

@@ -0,0 +1,15 @@
+{
+  "value": [
+    {
+      "id": 10,
+      "name": "Release Pipeline",
+      "folder": "\\"
+    },
+    {
+      "id": 20,
+      "name": "Build Pipeline",
+      "folder": "\\"
+    }
+  ],
+  "count": 2
+}

tests/tools/fixtures/azdo_pr.json

@@ -0,0 +1,16 @@
+{
+  "pullRequestId": 42,
+  "title": "Fix the auth bug",
+  "status": "active",
+  "sourceRefName": "refs/heads/bug/ALLPOST-999_fix-auth",
+  "targetRefName": "refs/heads/main",
+  "url": "https://dev.azure.com/my-org/my-project/_apis/git/repositories/my-repo/pullRequests/42",
+  "repository": {
+    "id": "repo-uuid-123",
+    "name": "my-repo",
+    "remoteUrl": "https://dev.azure.com/my-org/my-project/_git/my-repo"
+  },
+  "lastMergeSourceCommit": {
+    "commitId": "abc123def456"
+  }
+}

tests/tools/fixtures/azdo_pr_diff.txt

@@ -0,0 +1,11 @@
+diff --git a/src/auth.py b/src/auth.py
+index 1234567..abcdefg 100644
+--- a/src/auth.py
++++ b/src/auth.py
+@@ -10,6 +10,10 @@ class AuthService:
+     def authenticate(self, token: str) -> bool:
+-        return token == "hardcoded"
++        return self._validate_token(token)
++
++    def _validate_token(self, token: str) -> bool:
++        return len(token) > 0 and token.startswith("Bearer ")

tests/tools/fixtures/azdo_trigger_pipeline.json

@@ -0,0 +1,11 @@
+{
+  "id": 1001,
+  "buildNumber": "20240115.1",
+  "status": "notStarted",
+  "queueTime": "2024-01-15T10:00:00Z",
+  "definition": {
+    "id": 10,
+    "name": "Release Pipeline"
+  },
+  "sourceBranch": "refs/heads/main"
+}

tests/tools/fixtures/jira_issue.json

@@ -0,0 +1,10 @@
+{
+  "id": "12345",
+  "key": "ALLPOST-100",
+  "fields": {
+    "summary": "Fix the authentication bug",
+    "status": {
+      "name": "In Progress"
+    }
+  }
+}

tests/tools/fixtures/jira_transitions.json

@@ -0,0 +1,20 @@
+{
+  "transitions": [
+    {
+      "id": "11",
+      "name": "To Do"
+    },
+    {
+      "id": "21",
+      "name": "In Progress"
+    },
+    {
+      "id": "31",
+      "name": "Done"
+    },
+    {
+      "id": "41",
+      "name": "Released"
+    }
+  ]
+}