feat(cli): add comprehensive GitHub PR workflow commands

Add `codeframe pr` command group for GitHub Pull Request management:
- `pr create`: Create PRs with auto-generated descriptions from commits
- `pr list`: List PRs with status filtering and JSON output
- `pr get`: Get detailed PR information
- `pr merge`: Merge PRs with squash/merge/rebase strategies
- `pr close`: Close PRs without merging
- `pr status`: Show PR status for current branch

Implementation follows v2 CLI patterns (headless, no server required):
- Uses existing GitHubIntegration async client
- Wraps async calls with asyncio.run() for CLI context
- Full test coverage (23 tests) using TDD approach
- Environment-based configuration (GITHUB_TOKEN, GITHUB_REPO)

Commands registered in both v1 CLI (__init__.py) and v2 CLI (app.py).
Documentation updated in CLI_WIREFRAME.md with examples.

Author: Test User

codeframe/cli/__init__.py

@@ -316,6 +316,7 @@ def version():
 from codeframe.cli.session_commands import session_app  # noqa: E402
 from codeframe.cli.context_commands import context_app  # noqa: E402
 from codeframe.cli.review_commands import review_app  # noqa: E402
+from codeframe.cli.pr_commands import pr_app  # noqa: E402
 
 # Register Phase 1 command groups
 app.add_typer(auth_app, name="auth", help="Authentication (login, logout, register)")
@@ -332,6 +333,7 @@ def version():
 app.add_typer(session_app, name="session", help="Session management (get)")
 app.add_typer(context_app, name="context", help="Agent context (get, stats, flash-save, checkpoints)")
 app.add_typer(review_app, name="review", help="Code review management (status, stats, findings, list)")
+app.add_typer(pr_app, name="pr", help="Pull request management (create, list, merge, close)")
 
 
 if __name__ == "__main__":

codeframe/cli/app.py

@@ -4161,6 +4161,11 @@ def templates_apply(
 app.add_typer(templates_app, name="templates")
 app.add_typer(auth_app, name="auth")
 
+# Import and register PR commands for GitHub PR workflow
+from codeframe.cli.pr_commands import pr_app
+
+app.add_typer(pr_app, name="pr")
+
 
 # =============================================================================
 # Version command