fix(ci): resolve lint, typecheck, and test failures
Lint:
- Remove unused parseJsonlFile function (superseded by parseJsonlFileTail)
- Remove dead lastLogModified stat() call in getSessionInfo (field was
removed from AgentSessionInfo but the filesystem read was left behind)
Typecheck + Tests (ActivityDetection):
- session-manager.test.ts: update mocks to return { state: "active" } /
{ state: "idle" } instead of bare strings — getActivityState() returns
ActivityDetection | null, not ActivityState | null
- integration tests (aider, claude-code, codex, opencode): update imports
from ActivityState → ActivityDetection, variable types, comparisons
(activityState?.state !== "exited"), and assertions (?.state).toBe()
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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