Fix agent SIGINT abort context ordering

[KyleAMathews]

Summary

• let pi-agent-core settle aborted runs instead of immediately unsubscribing on SIGINT
• add a fallback timeout for providers/tools that ignore AbortSignal
• reorder model-facing timeline context so aborted run output appears before the SIGINT marker when server-appended signals race ahead of buffered runtime output
• add regression coverage for interrupted-run timeline ordering

Tests

• pnpm exec vitest run test/timeline-context.test.ts
• pnpm exec eslint src/pi-adapter.ts src/timeline-context.ts src/types.ts test/timeline-context.test.ts --quiet

Note: broader agents-runtime typecheck/test runs still fail in this worktree because of existing dependency/linkage issues (missing/mismatched pino, cron-parser, @mariozechner/pi-agent-core, localOnlyCollectionOptions, etc.).

[github-actions]

Electric Agents Desktop Builds

Build artifacts for commit ef3f50e.

Platform	Status	Artifact
macOS Apple Silicon	Passed	DMG
macOS Intel	Passed	DMG
Windows x64	Passed	Installer
Linux x64	Passed	AppImage / deb

Workflow run

[codecov]

Codecov Report

❌ Patch coverage is 95.18072% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.04%. Comparing base (8803b36) to head (ef3f50e).
⚠️ Report is 5 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/agents-runtime/src/timeline-context.ts	95.71%	3 Missing ⚠️
packages/agents-runtime/src/pi-adapter.ts	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4399      +/-   ##
==========================================
- Coverage   59.46%   56.04%   -3.42%     
==========================================
  Files         304      259      -45     
  Lines       30626    26983    -3643     
  Branches     8335     7502     -833     
==========================================
- Hits        18211    15122    -3089     
+ Misses      12397    11846     -551     
+ Partials       18       15       -3     

Flag	Coverage Δ
packages/agents	67.78% <ø> (+0.25%)	⬆️
packages/agents-mcp	?
packages/agents-runtime	81.14% <95.18%> (+0.46%)	⬆️
packages/agents-server	74.41% <ø> (-0.04%)	⬇️
packages/agents-server-ui	6.19% <ø> (-0.02%)	⬇️
packages/electric-ax	43.81% <ø> (ø)
packages/experimental	?
packages/react-hooks	?
packages/start	?
packages/typescript-client	?
packages/y-electric	?
typescript	56.04% <95.18%> (-3.42%)	⬇️
unit-tests	56.04% <95.18%> (-3.42%)	⬇️

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[samwillis]

LGTM
that flake was annoying!