feat(agent): redesign project_cli with module/method/input protocol

- Replace command/subcommand/args with module/method/input envelope
- Calendar handler uses discriminated union (mode) for read operations
- Strict Pydantic models with extra='forbid' for all calendar methods
- Worker max_iters=7, router prompt simplified (removed project_cli_defaults)
- Skill index cards + per-action files for progressive disclosure
- Frontend/AG-UI aligned to module/method dispatch
- Protocol docs updated to module/method/input contract

WIP: action cards need envelope fix, 2 tests need update, memory
handler needs Pydantic models.

pyproject.toml

@@ -40,10 +40,11 @@ default = true
 
 [tool.pytest.ini_options]
 testpaths = ["backend/tests"]
-addopts = "-q --import-mode=importlib"
+addopts = "-q --import-mode=importlib --ignore=backend/tests/quality"
 asyncio_mode = "auto"
 markers = [
     "live: requires running local runtime and real external dependencies",
+    "quality: model quality and cost evaluation (not part of CI, run manually)",
 ]
 
 [dependency-groups]