docs: record v0.1.155 runtime checkpoint [skip release]

[cafitac]

Summary

• Record the v0.1.155 release/runtime checkpoint after epoch-start scheduled dogfood measurement shipped.
• Update the short handoff/next-action docs and roadmap checkpoint to point at the active v0.1.155 runtime.
• Update the roadmap contract test expectation from v0.1.154 to v0.1.155.

Runtime QA

• Runtime: /Users/reddit/.agent-memory/runtime/v0.1.155/.venv/bin/agent-memory
• QA artifacts: /Users/reddit/.agent-memory/reports/v0.1.155-runtime-qa-20260513T133421/
• personal-oss Hermes hook accepted and doctor-green.

Safety

• Docs/test checkpoint only.
• Keeps broad G4/background apply, collapse/delete apply, default ranking migration, ordinary conversation auto-approval, and live telemetry reset blocked.

Tests

• uv run --python 3.11 pytest tests/test_roadmap_contract.py -q