chore: add pool queue size and thread count as Sentry measurements

[gausie]

Captures pool.queueSize and pool.threads as both span attributes and Sentry measurements on ComposeGraphsPool.composeGraphsInWorker spans.

• Span attributes — visible in the trace explorer on the individual span
• Sentry measurements — numeric, aggregatable at the transaction level for use in dashboards (avg, max, p95 etc.)

This supports building a Sentry dashboard for composition queue usage, split by hostname/pod.

Summary by CodeRabbit

• Chores
  • Updated development configuration files
  • Enhanced monitoring capabilities for worker pool performance tracking

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 74afd9a6-3cd3-48bd-80d0-1a38ea696f83

📥 Commits

Reviewing files that changed from the base of the PR and between 35a0ad6 and 5465c26.

📒 Files selected for processing (2)

• .gitignore
• controlplane/src/core/composition/composeGraphs.pool.ts

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Walkthrough

The PR adds Claude Code working directory patterns to .gitignore and extends Sentry observability instrumentation for the compose graphs worker pool by recording thread count metrics alongside existing queue size measurements.

Changes

Dev environment and observability updates

Layer / File(s)	Summary
Dev environment ignore patterns .gitignore	Claude Code working directory path .claude/worktrees/ added to the ignore configuration to keep IDE-specific artifacts out of version control.
Worker pool thread metrics controlplane/src/core/composition/composeGraphs.pool.ts	Compose graphs worker pool instrumentation extended to record pool.threads as a span attribute and Sentry measurement, providing visibility into active worker thread count alongside existing queue size metrics.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• wundergraph/cosmo#2931: Both PRs extend Sentry span instrumentation for the composition worker pool, with the related PR adding queueSize and this PR adding threads metrics.
• wundergraph/cosmo#2905: Both PRs modify composeGraphs.pool.ts to enhance Sentry tracing around the compose graphs worker pool.
• wundergraph/cosmo#2901: Both PRs add or extend Sentry instrumentation on the worker pool execution path in composeGraphs.pool.ts.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding pool queue size and thread count as Sentry measurements, which matches the implementation in the composition pool instrumentation file.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.13%. Comparing base (7961cf4) to head (065db28).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2940      +/-   ##
==========================================
- Coverage   66.31%   65.13%   -1.18%     
==========================================
  Files         258      327      +69     
  Lines       27357    47138   +19781     
  Branches        0     5241    +5241     
==========================================
+ Hits        18141    30703   +12562     
- Misses       7775    16411    +8636     
+ Partials     1441       24    -1417     

Files with missing lines	Coverage Δ
...olplane/src/core/composition/composeGraphs.pool.ts	88.05% <100.00%> (ø)

... and 584 files with indirect coverage changes

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