fix(parser): detach diagnostic locations from source

[ClaudiuCeia]

Depends on #31.

• Replaces source-retaining lazy getters for oversized unscoped parses with eager location snapshots.
• Preserves the existing plain data shape and keeps session-backed parsing lazy.
• Documents the direct parser invocation cost and recommends runParser or parseAll for large inputs.

Validation: bun run check, deno task check, bun run build, and bun run package:check.

[github-actions]

CI results

Check	Result
Formatting	Passed
Lint	Passed
Types	Passed
Tests	Passed
Benchmark correctness	Passed
Package	Passed
Bun runtime	Passed
Node 20/26	Passed
Deno / JSR	Passed
Performance	Passed

Performance

Passed: no benchmark exceeded the 15% regression threshold.

Results use the median p50 from 3 base and 3 head runs on the same runner.

Benchmark	Base	Head	Change	Result
construct/grammar	961.00 ns	932.00 ns	-3.0%	Pass
construct/grammar-and-first-parse	18.55 us	18.11 us	-2.4%	Pass
expression/invalid-late	341.36 us	335.46 us	-1.7%	Pass
expression/large	2.83 ms	2.77 ms	-2.4%	Pass
expression/medium	357.67 us	353.31 us	-1.2%	Pass
expression/small	17.61 us	18.24 us	+3.6%	Pass

[ClaudiuCeia]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-06T17:58:34.401197Z	1c4b4f4	Manual request

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: 1c4b4f4e7e

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