Support stored Map and Set iterators in static builds

[ctate]

Stored typed Map and Set iterators previously had no static lowering. This change lets const cursor = map.values(); cursor.next() compile without an embedded engine, and supports passing cursors, for...of, spreads, and mapper-less Array.from.

Reuse native live cursors and preserve reference identity for records, arrays, classes, and supported unions. Keep iterator helper methods such as .map() and .take() explicitly refused, and update differential fixtures, diagnostic snapshots, documentation, and the generated surface manifest.

Validation:

• 28 focused differential checks passed in release/dev profiles; the same 28 passed with AddressSanitizer and reference-count auditing.
• Iterator fixtures also passed in both lanes after integrating the latest main branch.
• All 140 diagnostic tests passed.
• Workspace build, lint, manifest drift check, and Node compatibility checks passed.
• Documentation type/build checks and all 22 route tests passed.

Full-suite validation is incomplete: the sanitized multi-instance library probe reports a 164-byte leak, reproduced on the unchanged starting commit 54d05461b8141731077fe303b697a925bce934d6. The broader plain run was stopped after confirming that existing full-gate blocker.

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Oct 2, 2026 5:11pm UTC