feat: Implement session deletion API (#105)

[furkankoykiran]

Summary

Implements the delete() method for the SessionClient class to enable permanent session deletion from both the Jules API and local cache.

Changes

• API Layer: Added DELETE method to ApiRequestOptions type
• Interface: Added delete() method signature to SessionClient interface with comprehensive JSDoc
• Implementation: Implemented delete() in SessionClientImpl with:
  • API-first approach (call API before modifying cache)
  • Graceful 404 handling (idempotent deletion)
  • Proper error propagation for non-404 errors
  • Write-through cache cleanup
• Tests: Added comprehensive test coverage including:
  • Success case (API called + cache cleaned)
  • 404 case (graceful handling + cache cleanup)
  • Error case (non-404 errors propagated + cache NOT cleaned)

Test Results

• ✅ All 3 new delete() tests pass
• ✅ Type checking passes (3 successful, 3 total)
• ✅ Session tests pass (20 passed | 1 skipped)
• ✅ Build passes (4 successful, 4 total)
• ✅ Smoke test passes (install + type check + runtime)
• ✅ No regressions in related functionality

Implementation Details

The implementation follows the existing patterns established by archive() and unarchive() methods:

• Uses the same API request pattern via this.request()
• Follows write-through caching strategy
• Uses the existing sessionStorage.delete() method
• Includes comprehensive error handling
• Well-documented with JSDoc comments

Resolves

Fixes #105

References

• Issue: [Fleet Execution] API Protocol Alignment: Session Deletion #105
• Implementation follows Issue [Fleet Execution] API Protocol Alignment: Session Deletion #105 specifications exactly