v0.5.42 release (latest)

v0.5.42 release notes for the GitHub Release v0.5.42 (release task: Issue #1308).

Tag state (verified against origin)

Ref	Object	Points at
`v0.5.42`	annotated tag `c1150e1b29f1346347a76afb410a53df938e2bcb`	commit `a8e388dc37d0b454ce5e794528a2c2d9a05ce7d8`

config.py: four hand-copied seconds validators, route them through the existing _positive_seconds (Issue #610; PR #1315)
A finished Milestone with no release ticket waits silently: surface it through the existing /milestone decision notice (Issue #856; PR #1314)
auto_next_milestone 默认 true 时，milestone set 写入的值会被下个空闲 tick 的自动推进改写，命令输出与实际行为相反 (Issue #933; PR #1311)
Extract the claim domain into src/orbi/claim.py: 17 definitions and ~850 lines leave runner.py (Issue #1259; PR #1317)

Runner fails after fresh branch push before PR creation (Issue #898; PR #1312)
Idle auto-advance writes the host config, so a repository-declared active_milestone never advances (Issue #1304; PR #1305)
orbi milestone set reports success but writes only the host config when the repo policy declares active_milestone (Issue #1306; PR #1309)
/milestone release-ticket step guesses version_file = pyproject.toml when detection finds nothing (Issue #1307; PR #1310)