docs(mcp): publish warm search comparisons

[dmtrKovalenko]

Consolidated into #928. Continue review there.

Update MCP documentation and charts for the small repo and big repo buckets. Remove the comparison scripts and keep held-out results separate.

---

Bucket	Model	Shell time	FFF time	Wall reduction	Token reduction
Small repo	Opus 5.5	10.4 s	9.2 s	11.7%	8.6%
Small repo	GPT-6 Astra	9.0 s	8.1 s	10.3%	6.7%
Big repo	Opus 5.5	24.7 s	14.3 s	42.1%	3.4%
Big repo	GPT-6 Astra	21.7 s	10.4 s	52.2%	8.2%

Six additional tasks in the small repo bucket were frozen before tuning. The selected implementation produced these results:

Model	Wall reduction	Token reduction
Opus 5.5	15.8%	15.7%
GPT-6 Astra	-10.5%	-12.3%

All 72 recorded trials returned correct answers. The 50% target remains unmet in the small repo bucket. Negative reductions indicate regressions.

Trials run sequentially with a fresh model context. Startup, indexing, and initial Git refresh occur before timing. Both arms use the same source-verification rule. The MCP client exposes tools directly. Tokens include cached input.

The repository keeps the charts and documentation. Comparison scripts, their tests, and generated measurement files are removed. Original measurements and private traces remain local.

Both charts use aligned comparison rows and a compact layout. Titles, legends, labels, and values are unchanged; subtitles and footers remain removed. Only the small repo had a separate held-out run.

Stacked on #928.

Stack merge order: #924, #925, #927, #928.

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