Give stall recovery a full timeout grace after the first nudge

[TheGreatAxios]

Summary

• Records stallNudgeAt on the first stall nudge and waits through queued empty stall pings inside stallTimeoutMs without treating them as activity or restarting grace
• Stops the leaf only once the grace elapses with no tool.done or turn reset

Verification

• Focused tests for stall nudge grace passed
• bun run check blocked by known pre-existing main failures

Fixes CL-7651

[linear-code]

CL-7651

[TheGreatAxios]

Critic · Request changes

Director logic: first empty ping records stallNudgeAt and nudges; later pings inside stallTimeoutMs wait; salvage only after grace. tool.done and turn-boundary inference.done clear the flag.

Findings

• Extra merge/release/rebased-parent commits land relative to the stacked base (merge-base 57226a72).
• Two-dot vs stacked tip still ships package.json 0.3.19 → 0.3.20 and a ## [0.3.20] section under empty Unreleased.

[TheGreatAxios]

Review · Request changes

Stall-nudge grace after the first empty ping matches the stated policy, but this PR is not stacked on cl-7648.

Findings

• GitHub base cl-7648-coalesce-tool-failure-interventions is not an ancestor of HEAD. Three-dot includes 0.3.20 release/merge plus rebased 885/886. Rebase onto current stacked tip before merge.
• Stall grace has no Unreleased changelog bullet once the 0.3.20 dump is not the changelog hunk.

Notes

GitHub blocks request-changes on own PRs, so this is a comment with that verdict.