refactor(routines): extract declaration compiler crate

[jscott3201]

Summary

• Move the existing G36 declaration checker and its 10 tests byte-for-byte into an unpublished ocl-routine-compiler package.
• Keep cxf-verify's public re-export, CLI behavior, diagnostics, and binary path unchanged through a sibling path dependency.
• Cache and test both standalone Cargo packages in CI without introducing a workspace or engine dependency in the compiler package.

Validation

• ocl-routine-compiler: 10 tests
• cxf-verify: 12 tests
• routine lint suite: 189 tests
• dataset harness: 32 tests plus tiny FPU replay assertions
• exact G36 source inventory: 431 release / 693 development files
• declaration, routine, and full fault-library gates passed

[jscott3201]

Cycle 1 — exact head 3f30f176972621d8b688b0f99d8ea40a4ea59fe1

PASS: both independent reviewers found no blocker/major findings and no deferred minor observations. The declaration implementation is a byte-for-byte move, the verifier API/CLI call path and binary location are preserved, and the standalone package has no engine/path/build dependency. Local focused and full gates passed. Merge eligibility remains conditioned on the in-progress exact-head verify check.