chore: staging 0.35.3rc14

[Nathan Schram (nathanschram)]

Summary

Stage 0.35.3rc14 to TestPyPI. Bundles four PRs merged this cycle on dev:

• fix: #502 — skip control-channel events from last_event_type #519 fix: skip control-channel events from last_event_type (closes bug: runner's proc.wait() doesn't fire when CC subprocess exits cleanly post-result — watchdog is the only safety net #502)
• fix: #494 — liveness_stalls counter, cpu_active reliability, approval-aware stall message #520 fix: liveness_stalls counter, cpu_active reliability, approval-aware stall message (closes monitor: high peak_idle (17477s) on 'brand-copilot' #494)
• fix: #518 — derive retry_after_s from reset timestamps, log full RateLimitInfo #521 fix: derive retry_after_s from reset timestamps, log full RateLimitInfo (closes monitor: rate-limit burst on new session start (5 events in 85s on 'bip') #518)
• docs: #517 — note cumulative session cost is not capped, recommend max_cost_per_day #522 docs: cumulative session cost not capped, recommend max_cost_per_day (closes monitor: expensive single run on 'legal-librarian-local' ($26 / 225 turns / 16 min) #517)

No CHANGELOG update — rc versions are skipped by validate_release.py.

Test plan

• CI green
• TestPyPI publish succeeds (Publish to TestPyPI job)
• pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple untether==0.35.3rc14 resolves cleanly
• After merge: stage to @hetz_lba1_bot via scripts/staging.sh install 0.35.3rc14 and run integration tier per the changed-areas in docs/reference/integration-testing.md

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