feat: Guard against unbounded synchronous promise chain recursion

[nev21]

Resolving a very deep or "hostile" self-resolving thenable through createSyncPromise could grow the call stack without bound and overflow it. syncItemProcessor now tracks consecutive synchronous continuations and forces a microtask hop once a configurable depth setMaxSyncPromiseChainDepth, default 200) is exceeded, letting the stack unwind before continuing.

[Copilot]

Pull request overview

Adds a safety guard to the synchronous promise reaction processor so deeply (or recursively) chained synchronous continuations can’t grow the call stack without bound, by forcing a microtask hop once a configurable chain depth is exceeded.

Changes:

• Introduces a configurable max synchronous chain depth and enforces it in syncItemProcessor via _runPendingItem.
• Exposes the new configuration API (setMaxSyncPromiseChainDepth) from the package entrypoint.
• Adds targeted tests covering shallow chains, very deep chains (no stack overflow), forced microtask hop behavior, and disabling/resetting the guard.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
lib/src/promise/itemProcessor.ts	Adds depth tracking + guard logic and a new setter to configure the max synchronous chain depth.
lib/src/index.ts	Re-exports setMaxSyncPromiseChainDepth as a public API.
lib/test/src/promise/syncChainDepth.test.ts	Adds regression and behavior tests for deep/recursive sync promise chains and configuration options.

[codecov]

Codecov Report

❌ Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.55%. Comparing base (59999ea) to head (8f5cf13).

Files with missing lines	Patch %	Lines
lib/src/promise/itemProcessor.ts	97.67%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #527      +/-   ##
==========================================
- Coverage   97.57%   97.55%   -0.02%     
==========================================
  Files          28       28              
  Lines        1484     1516      +32     
  Branches      350      358       +8     
==========================================
+ Hits         1448     1479      +31     
- Misses         36       37       +1     

Files with missing lines	Coverage Δ
lib/src/promise/itemProcessor.ts	98.66% <97.67%> (-1.34%)	⬇️

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

Files not reviewed (1)

• common/config/rush/npm-shrinkwrap.json: Generated file

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[nevware21-bot]

Approved by nevware21-bot