feat: v3 simulation action configs and improved multi-file extraction

Add 5 action YAML configs for v3 simulation stress tests (todo-cli,
bookstore-api, websocket-chat, hn-scraper, flask-auth). Update
multi-file markdown extraction regex to also match bold-only headers
(**filename.py**) without requiring # prefix.

actions/sim1-todo-cli.yaml

@@ -0,0 +1,11 @@
+name: local/todo-cli
+description: >
+  Build a command-line TODO application in Python with add, list, complete,
+  and delete commands. Store tasks in a JSON file. Include a Task dataclass
+  with id, title, completed, and created_at fields.
+strategy_actor: anthropic/claude-sonnet-4-20250514
+execution_actor: anthropic/claude-sonnet-4-20250514
+definition_of_done: >
+  A todo.py file exists with CLI commands for add, list, complete, and delete.
+  Tasks are persisted in a tasks.json file. A Task dataclass has id, title,
+  completed, and created_at fields.

actions/sim2-bookstore-api.yaml

@@ -0,0 +1,13 @@
+name: local/bookstore-api
+description: >
+  Build a REST API for a bookstore using FastAPI. Include endpoints for
+  CRUD operations on books (GET /books, GET /books/{id}, POST /books,
+  PUT /books/{id}, DELETE /books/{id}). Use Pydantic models for Book
+  with fields: id, title, author, price, isbn. Store books in memory.
+  Include requirements.txt.
+strategy_actor: anthropic/claude-sonnet-4-20250514
+execution_actor: anthropic/claude-sonnet-4-20250514
+definition_of_done: >
+  A main.py with FastAPI app has all CRUD endpoints for books.
+  A Book Pydantic model has id, title, author, price, isbn fields.
+  A requirements.txt lists dependencies.

actions/sim3-websocket-chat.yaml

@@ -0,0 +1,12 @@
+name: local/websocket-chat
+description: >
+  Build a WebSocket chat server in Python using the websockets library.
+  Support multiple connected clients, broadcast messages to all clients,
+  handle connect/disconnect events, and include a simple HTML client page.
+  Include requirements.txt.
+strategy_actor: anthropic/claude-sonnet-4-20250514
+execution_actor: anthropic/claude-sonnet-4-20250514
+definition_of_done: >
+  A server.py implements a WebSocket chat server with broadcast support.
+  An index.html provides a browser-based chat client.
+  A requirements.txt lists dependencies.

actions/sim4-hn-scraper.yaml

@@ -0,0 +1,12 @@
+name: local/hn-scraper
+description: >
+  Build a Hacker News scraper in Python using requests and BeautifulSoup.
+  Scrape the front page for top stories including title, URL, points, and
+  comment count. Output results as JSON. Include a Story dataclass and
+  requirements.txt.
+strategy_actor: anthropic/claude-sonnet-4-20250514
+execution_actor: anthropic/claude-sonnet-4-20250514
+definition_of_done: >
+  A scraper.py fetches and parses Hacker News front page stories.
+  A Story dataclass has title, url, points, and comments fields.
+  Results are output as JSON. A requirements.txt lists dependencies.

actions/sim5-flask-auth.yaml

@@ -0,0 +1,12 @@
+name: local/flask-auth
+description: >
+  Build a Flask web application with user authentication. Include register
+  and login endpoints, password hashing with bcrypt, JWT token generation,
+  and a protected endpoint that requires authentication. Use SQLite for
+  user storage. Include requirements.txt.
+strategy_actor: anthropic/claude-sonnet-4-20250514
+execution_actor: anthropic/claude-sonnet-4-20250514
+definition_of_done: >
+  An app.py has Flask routes for register, login, and a protected endpoint.
+  Passwords are hashed with bcrypt. JWT tokens are used for auth.
+  SQLite stores users. A requirements.txt lists dependencies.

src/cleveragents/agents/graphs/plan_generation.py

@@ -63,14 +63,12 @@ PATH_HINT_RE = re.compile(r"@(?P<path>[\w./-]+)")
 
 # Regex for extracting files from markdown-formatted LLM output.
 # Supports many common header patterns:
-#   ## filename.py
-#   ## `filename.py`
-#   ## 1. `filename.py`
-#   ### path/to/file.py
-#   ## **filename.py**
-#   # filename.py
+#   ## filename.py           ## `filename.py`
+#   ## 1. `filename.py`      ### path/to/file.py
+#   ## **filename.py**       # filename.py
+#   **filename.py**          **`filename.py`**
 _FILE_HEADER_RE = re.compile(
-    r"^#{1,3}\s+(?:\d+\.\s+)?[`*]*(?P<path>[^\s`*]+\.[a-zA-Z0-9]+)[`*]*\s*$",
+    r"^(?:#{1,3}\s+(?:\d+\.\s+)?)?[`*]*(?P<path>[^\s`*]+\.[a-zA-Z0-9]+)[`*]*\s*$",
     re.MULTILINE,
 )
 _FENCED_BLOCK_RE = re.compile(