feat(map): add PineMap runtime semantics

[luisleo526]

Summary

• add a header-only PineMap runtime with Pine ID aliasing, explicit map.copy separation, insertion ordering, typed missing values, null IDs, and the 50,000-pair limit
• preserve Pine float-key behavior for na and signed zero
• add primitive-only snapshot/restore support that preserves original identity across rebinding, including rebinding to na
• document that codegen migration and recursive UDT/collection checkpointing remain pending

Validation

• full Debug engine suite: 112/112
• full Release engine suite: 113/113
• focused Debug and Release test_map: green
• AppleClang strict warnings-as-errors: green
• ASan/UBSan focused test_map: green
• installed-header consumer: green
• exhaustive N=5 semantic matrix: 32/32, publication gate true
• matrix fingerprint: af52940645de2e1a80fafe684581d4b9717c33e2f3b20e95622571a2ff4db409
• matrix manifest SHA-256: 82186b953e6510bbeb2a6c0dcdac81073fa9173e20b338676a02fcd60178108d
• matrix summary SHA-256: 8f38503e484796fc73094b5176e58ce9dd48af70756bba8a2b42a6504fe3597a

CI follow-up

• Release initially exposed side-effecting test calls inside assert; the test was corrected to execute mutations outside assertions
• runtime implementation is unchanged by that test-only follow-up

Provenance

• tested commit: 9a07532
• tested tree: 8739413d058ce6d812ec38a61442802e056eb2a2
• merge commit: 06bb724
• merge tree: 8739413d058ce6d812ec38a61442802e056eb2a2 (identical to tested tree)