feat(tree): Allow event buffering during transactions

[Josmithr]

Adds a bufferEvents flag to runTransaction, which allows users to opt-into deffering events until after the transaction has completed.

[github-actions]

Hi! Thank you for opening this PR. Want me to review it?

Based on the diff (288 lines, 4 files), I've queued these reviewers:

• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
• Performance — algorithmic regressions, memory leaks
• Testing — coverage gaps, hollow tests

How this works

• Adjust the reviewer set by ticking/unticking boxes above. Reviewer toggles alone don't trigger anything.

• Tick Start review below to dispatch the review fleet.

• After review finishes, tick Start review again to request another run — it auto-resets after each dispatch.

• This comment updates as new commits land; your reviewer selections are preserved.

• Start review