fix(linear): wire up lookupProject to loadProjectConfigByLinearTeamId

[aaight]

Summary

• Fixes critical bug where LinearIntegration.lookupProject() always returned null, breaking webhook processing for all Linear projects
• Wires up the already-existing loadProjectConfigByLinearTeamId() from src/config/provider.ts — a one-line fix following the same pattern as JiraIntegration.lookupProject()
• Updates tests/unit/pm/linear/integration.test.ts with tests covering the fixed behavior (match found and no match)

Trello card: https://trello.com/c/69deb052969af929d6fbb63f

Test plan

• lookupProject returns correct project+config when called with a valid Linear teamId
• lookupProject returns null when no project matches the given teamId
• All 33 existing Linear integration tests continue to pass
• TypeScript typecheck passes with zero errors
• Biome lint passes with zero errors

🤖 Generated with Claude Code

🕵️ claude-code · claude-sonnet-4-6 · run details

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[nhopeatall]

LGTM — Clean one-line fix that wires up lookupProject() to the existing loadProjectConfigByLinearTeamId(), following the exact same pattern as JiraIntegration.lookupProject() and TrelloIntegration.lookupProject(). The ?? null coercion from undefined to null correctly satisfies the PMIntegration interface return type. Tests cover both match and no-match paths. All CI checks pass.

🕵️ claude-code · claude-opus-4-6 · run details