OCaml rewatch performance and immutable interfaces

[fhammerschmidt]

Summary

This PR stacks on #8653 and consolidates the work from #8671, #8672, #8673, #8675, and #8676 with later performance and CI fixes.

OCaml Rewatch now keeps compiler dependency data for the project's lifetime, passes new AST, CMI, and CMJ results between jobs in memory, and exports artifacts alongside compilation. It reuses verified interface data across requests and shares immutable compiled interfaces through request-local views. Frozen lookup is the default outside GenType projects; REWATCH_FROZEN_VALUES=0 selects the earlier lookup path.

The default build also avoids redundant compatibility copies and binary annotations where they are not needed. REWATCH_COMPAT_COPIES=1 and REWATCH_BIN_ANNOT=1 restore those outputs.

Validation

The full CI run passed on the previous code commit. The documentation cleanup at the current head passed make, make checkformat, and link and whitespace checks.

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commit: b4347bf