refactor: rename internal signal modules

[brnrdog]

Summary

• Remove from rescript-signals package.
• Rename internal module files , , and to , , .
• Keep the public entrypoint API in via module wrappers so existing API remains , , and .

Validation

• npm run build
• npm run test

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve benchmark-facing module file names

Switching the public wrappers to Signals__* modules means npm run build will no longer generate src/signals/Signal.res.mjs, Computed.res.mjs, and Effect.res.mjs. I checked .github/workflows/benchmark-pr-vs-main.yml and .github/workflows/benchmark-pr-vs-frameworks.yml: both run scripts/ci/benchmark-pr-vs-*.mjs, and those scripts’ resolveSignalsDir logic hard-codes the old filenames, so they will throw and fail the benchmark job after this change. Please either keep compatibility shim files with the old names or update the benchmark loaders in the same commit.

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