v0.55.7

What's Changed

• fix(orchestrator): close Windows heartbeat lease release races by @sergiobuilds in #2528
• feat(mcp): add bounded runtime doctor by @lee3Q in #2420
• feat(mcp): add opt-in local stdio doctor probe by @lee3Q in #2406
• chore(deps): bump the python-minor-patch group across 1 directory with 7 updates by @dependabot[bot] in #2501
• fix(boundary): run the oracle harness on Python 3.5 task interpreters by @Q00 in #2553
• chore(release): prepare v0.55.7 by @Q00 in #2554

Full Changelog: v0.55.6...v0.55.7