fix(package_json): stop stripping raw_json fields (keep all)

[stormslowly]

Why

PackageJson::raw_json() exposes the parsed package.json to consumers, but JSONCell::try_new stripped description/keywords/scripts/dependencies/devDependencies/peerDependencies/optionalDependencies before storing it — so the "raw" API was not actually raw. This PR stops stripping; the full document is retained.

What

This PR is stacked on #269 (the feature-on baseline that keeps stripping). The only diff against #269 is removing the json_object.remove(...) calls, so the CodSpeed report on this PR compares keep vs strip directly — one table, same lineage, same runner (no environment warning).

Strip vs keep (feature on, same environment)

Both built with package_json_raw_json_api; the only difference is whether fields are stripped:

Mode	Benchmark	strip (#269)	keep (this PR)	Δ
Memory	single-thread	12.8 MB	19.4 MB	+6.6 MB (+52%)
Memory	resolve with many extensions	17.9 MB	24.4 MB	+6.5 MB (+36%)
CPU	single-thread	62.0 ms	72.1 ms	+16%
CPU	multi-threaded resolve	71.3 ms	82.9 ms	+16%
CPU	resolve with many extensions	137.6 ms	148.8 ms	+8%

7 of 12 benchmarks unchanged (tsconfig, pnp, …). Memory is deterministic heap bytes and reproduced byte-for-byte across runs. Keeping the fields costs ~6.6 MB / ~16% on parse-heavy paths — the price of materializing dependencies/scripts/… into serde_json::Value for every package.json.

Measurement/review pair with #269 — not intended to merge as-is.

[codspeed-hq]

Merging this PR will degrade performance by 19.76%

❌ 5 regressed benchmarks
✅ 7 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	resolver[single-thread]	12.8 MB	19.4 MB	-33.82%
❌	Memory	resolver[[single-threaded]resolve with many extensions]	17.9 MB	24.4 MB	-26.66%
❌	Simulation	resolver[[multi-threaded]resolve]	71.3 ms	82.9 ms	-13.92%
❌	Simulation	resolver[single-thread]	62 ms	72.1 ms	-13.91%
❌	Simulation	resolver[[single-threaded]resolve with many extensions]	137.6 ms	148.8 ms	-7.55%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing fix/package-json-raw-keep-fields (4e3bc52) with bench/raw-json-feature-on-baseline (b9e212a)}