Add context7.json for documentation indexing

[dchud]

Summary

• New context7.json configuring Context7 to index source, bindings, Python package, docs, and examples
• Excludes archival/build/data directories (docs/history, target, tests/data, etc.)
• Documents _mrrc.pyi as canonical API reference in rules field

Test plan

• Docs-only change, no code affected
• Verify valid JSON: python3 -c "import json; json.load(open('context7.json'))"

🤖 Generated with Claude Code

[codspeed-hq]

Merging this PR will degrade performance by 15.65%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

❌ 3 (👁 3) regressed benchmarks
✅ 57 untouched benchmarks
⏩ 16 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
👁	WallTime	test_pipeline_sequential_extraction_4x_10k	105.2 ms	119.1 ms	-11.64%
👁	WallTime	test_process_4_files_sequential	84.9 ms	100.6 ms	-15.65%
👁	WallTime	test_pipeline_sequential_4x_10k	84.7 ms	95.5 ms	-11.3%

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_{Comparing docs/context7-config (f1d357a) with main (219cbb8)}

Footnotes

1. 16 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩