Tasks: PyYAML is a required runtime dependency of the CLI

Phase 3 of 3, derived from requirements.md and design.md. A DAG — tasks with no unmet dependency can run in parallel.

DAG

Tasks

[x] T1 — Declare PyYAML as required. cli/pyproject.toml: dependencies = ["pyyaml>=6"], config = [] as a deprecated no-op extra, comments updated. Refresh uv.lock via uv sync. (R1.1, R1.2, R1.3, R1.4)
[x] T2 — cli_config.py. Module-level import yaml; delete the try/except ImportError in load_cli_config; keep the file/parse leniency and the strict semantics; rewrite the module docstring's zero-dep reasoning. (R2.1, R2.2, R2.3, R3.3)
[x] T3 — eventlog.py. Same removal in load_config; update its docstring ("{} without PyYAML" is no longer how it can return {}). (R2.1, R2.2, R3.3)
[x] T4 — commands/scenarios.py. Same removal in _load_config_globs; update the module and function docstrings. (R2.1, R2.2, R3.3)
[x] T5 — Metadata test. test_pyyaml_is_a_required_runtime_dependency in cli/tests/test_cli.py: importlib.metadata.requires("the-loopy-one") carries a bare pyyaml requirement with no extra == marker. (R4.1)
[x] T6 — decision-038 + supersede pointers. New docs/decisions/decision-038.md; index row in decisions.md; a superseded-in-part pointer on decision-005 and decision-030. (R3.1, R3.2)
[x] T7 — Prose fixes. README.md, cli/README.md (intro + both install blocks), docs/architecture/architecture.md, skills/the-loop/reference/automation.md, and the webhook/__init__.py / commands/gh_webhook.py docstrings. (R3.3, R3.4)
[x] T8 — Capability doc. docs/capabilities/cli.md: correct the zero-dep behaviour bullet and the header line; add the issue-97 history row. (R3.5)
[x] T9 — Local gate. make check green: ruff, markdownlint, ruff format --check, pyright, config validation, pytest — including the pre-existing YAML tests unmodified. (R2.4, R4.2)
[x] T10 — Self-review cycles (reviews.selfReviewCount: 3, one with the security lens), findings recorded in the execution log.
[x] T11 — PR + reviewer briefing, phase label → loop:needs-review.