perf: externalize unused YAML parser

[chenjiahan]

Summary

lint-staged is always invoked with an explicit config object, so its optional YAML config loader is unreachable in Rstack. This PR externalizes yaml, removing the generated YAML chunk and the related buffer/process CommonJS bridges without changing supported behavior.

Performance

Metric	Before	After	Change
Top-level JS output	708,081 B	387,889 B	-320,192 B (-45.2%)
Bundled yaml.js	317,427 B (49,983 B gzip)	0 B	Removed

Measured from packages/rstack/dist after pnpm --filter rstack build.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d2103636-4642-47e9-acb7-7b5020f6da65

📥 Commits

Reviewing files that changed from the base of the PR and between 051fd52 and 8acfbb5.

📒 Files selected for processing (1)

• packages/rstack/rslib.config.ts

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📝 Walkthrough

Walkthrough

The library build configuration now externalizes both jiti and yaml. Comments clarify that lint-staged always receives an explicit configuration object, so the optional YAML configuration loader is not used.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: externalizing an unused YAML parser for performance.
Description check	✅ Passed	The description matches the changeset and explains the YAML externalization and performance impact.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/perf-externalize-yaml

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