[codex] Add Context7 configuration

[jderochervlk]

Summary

• Add a root context7.json for Context7 indexing.
• Frame the package as ReScript the language, not as compiler repository internals.
• Limit indexing to repository-local documentation, the standard library runtime surface, and documented rescript-tools CLI material.
• Exclude compiler, parser, rewatch/build-system, broad test fixtures, tooling implementation files, changelog, and contributor/admin content.
• Point Context7 consumers to https://rescript-lang.org/llms.txt for website-hosted language, manual, React, and ecosystem documentation.

Tests and Fixtures

I reviewed tests/tools_tests and the broader test tree. They are useful maintainer fixtures, but I left tests excluded because indexing them would mix deprecated API migration inputs, expected outputs, and implementation-focused compiler/build fixtures into user-facing Context7 results. tools/src/migrate.md keeps the useful migration CLI context without that noise.

Validation

• Parsed context7.json with Node.
• Checked the selected fields and constraints against the published Context7 schema.
• Re-ran local assertions that the included folders, source exclusions, test exclusion, rescript-tools rule, and llms.txt rule are present.

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commit: e84f387

[fhammerschmidt]

Do we somehow need to specifically state that the docs are found e.g. in

/@rescript/runtime/lib/ocaml/Stdlib_Bool.resi

[jderochervlk]

No, the folders just tells it where to scan. The rules are for anyone accessing the library from context7, not for instructions on how it should parse things. From what I can tell it does a decent job of figuring things out.

[jderochervlk]

I'll need someone with merge permissions to merge this in for me.