fix(hooks): ignore .brigade artifact writes in closeout gate (#483)

[solomonneas]

Summary

• Stop the work-loop Stop hook from re-demanding verification when the only writes since capture are Brigade internal artifacts under .brigade/ (e.g. detached brigade run output in .brigade/runs/).
• Treat brigade run bash like routed brigade work verify: skip PostToolUse write tracking so orchestration does not bump last_verification_write_at.
• Add regression tests for artifact-only updates, post-capture source edits, and brigade run bash.

Closes #483.

Test plan

• pytest tests/test_claude_hooks_runtime.py (70 passed)
• ./scripts/verify (full suite green)

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