perf: optimize hot paths in event handling

[shenald-dev]

• Optimized hot paths in the file watcher's event processing.
• Avoided repeated string length calculations in path slicing by pre-computing lengths in __init__.
• Removed redundant existence checks inside the compound regex path accumulation loop by moving the if check outside.
• Replaced getattr(event, ...) calls with direct attribute access (event.event_type, event.src_path) since watchdog events guarantee these attributes, avoiding builtin overhead.
• (A brief experiment with an any() generator showed it was slower than an explicit for loop, so the original for loop was preserved).
• Logged these specific Python performance insights into the .jules/bolt.md journal.

---

PR created automatically by Jules for task 18339441790131115798 started by @shenald-dev

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[shenald-dev]

The changes look solid and are well-justified. Ensure that the unit tests still cover the modified hot paths, especially the regex accumulation loop, to guard against any regressions.

Reviewed — quality: high

[shenald-dev]

Looks good, merging this in. CI is green and everything checks out 👍

Optimize hot paths in event handling by precomputing string lengths and using direct attribute access.

[google-labs-jules]

The changes look solid and are well-justified. Ensure that the unit tests still cover the modified hot paths, especially the regex accumulation loop, to guard against any regressions.

Reviewed — quality: high

Thank you for the review! I have verified that all unit tests, including those covering the modified hot paths, pass successfully without any regressions.

[google-labs-jules]

Looks good, merging this in. CI is green and everything checks out 👍

Optimize hot paths in event handling by precomputing string lengths and using direct attribute access.

Acknowledged.