compiler: remove legacy intrinsic actor catalog

[julia-script]

Summary

• remove the transitional legacyActors catalog and its flattening adapter
• construct final Intrinsic.* identities and audit metadata directly
• make intrinsicOperations the single canonical intrinsic catalog
• drop empty legacy-only actor entries while preserving the primitive inventory
• strengthen AGENTS.md with a repository-wide green-field policy that requires obsolete paths and compatibility scaffolding to be deleted

Why

The minimal intrinsic-boundary migration retained the old actor/member catalog as temporary scaffolding, then later intrinsic additions continued extending it. Silk has not been released, so preserving that internal compatibility shape adds complexity without serving users.

The agent policy now makes that project stage operational: current APIs and representations are migration targets, not compatibility contracts, and a change remains incomplete while its superseded path or deferred cleanup remains.

Impact

The compiler refactor preserves source-visible intrinsic spellings, semantic rules, inventory ordering, and execution behavior. Future repository changes are explicitly directed toward the clean eventual stable design without shims, aliases, fallbacks, migrations, deprecated entry points, or dual paths.

Validation

• pnpm typecheck
• pnpm exec biome check .
• pnpm test
• pnpm check
• focused IntrinsicCatalog.test.ts run
• git diff --check after the documentation update

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