test(272): add skipped phase dot coloring coverage to TestPhaseTimelineDotColoring

[decko]

Summary

Verifies that skipped phases render with the muted phase-status-skipped CSS class in the phase timeline dot component.

Two tests in TestPhaseTimelineDotColoring cover the skipped-phase path:

• test_skipped_phase_has_skipped_dot — a monitor phase with status=skipped renders the phase-status-skipped CSS class.
• test_verify_pass_verdict_but_skipped_status_gives_skipped_dot — skipped execution status takes priority over a PASS verdict on the verify phase.

Both tests were already present in the codebase (landed in prior commits). This ticket adds the towncrier changelog fragment documenting the coverage.

Acceptance Criteria

• test_skipped_phase_has_skipped_dot exists and passes in TestPhaseTimelineDotColoring
• test_verify_pass_verdict_but_skipped_status_gives_skipped_dot exists and passes in TestPhaseTimelineDotColoring
• All 18 TestPhaseTimelineDotColoring tests pass
• All 1963 tests pass
• Towncrier fragment changes/272.misc created and committed
• Ruff linting and formatting clean
• Type checking clean (no regressions)

Specialist Review Results

Implementation

• Status: ✅ PASS
• Both skipped-phase tests confirmed to exist and pass
• 1 file created (changes/272.misc), 1 commit (da61c4d)
• All 1963 tests pass

Verification

• Status: ✅ PASS
• Tests verified at lines 2989 and 3110 of the test file
• Only change in commit is the towncrier fragment
• No source or test files modified — tests were already landed

Review

• Status: ✅ PASS
• Total findings: 0
• No issues found

Refs #272

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Assisted-by: Claude Opus 4.6 (1M context) noreply@anthropic.com
Assigned-by: decko