Refresh README and docs drift coverage

[jonathanperis]

Summary

• refresh README claims that had drifted from current code/test behavior
• document docs-site lint/drift commands and production analytics env wiring
• update build-system wiki docs for the expanded docs-drift coverage
• extend tools/check_docs_drift.py so stale README/docs command claims are caught automatically

Verification

• git diff --check
• make docs-drift
• make test CC=clang
• (cd docs && bun run drift && bun run lint && bun run build)
• stale-assertion smoke for README/wiki output in built docs

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: a73bf104-6ccc-4bc2-9628-57eb5f3336e3

📥 Commits

Reviewing files that changed from the base of the PR and between bb2c81d and d9594d4.

📒 Files selected for processing (5)

• README.md
• docs/README.md
• docs/package.json
• docs/wiki/build-system.md
• tools/check_docs_drift.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-wiki-drift-audit

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