fix: preserve forward local temporary-array return types

[luisleo526]

Summary

• reconcile an adjacent one-hop ordinary local identity return after a later zero-argument UDF primitive type becomes known
• reuse the already-captured temporary-array initializer without revisiting stateful AST call sites
• fail closed for typed/persistent, non-adjacent, recursive, shadowed alias-path, parameterized, and non-direct shapes

This is deliberately narrower than general alias inference: only one unique adjacent ordinary declaration whose initializer is the established direct temporary-array read may participate.

Validation

• focused forward-local suite: 45/45
• full native suite: 2,203 passed, 2 skipped
• release self-test: green
• Pyodide/release parity: 277/277
• exhaustive 2^5 differential: base 12/16, candidate 16/16 across 32 executions
• exact 915-source differential: zero output/error changes
• git diff --check and Python compile checks: green

Separate residual

The direct-terminal element-callee shadow fast path remains a separate pre-existing lane: base and this candidate are byte-identical across its N=3 eight-cell matrix. This PR neither claims nor masks that fix; it will be handled independently with four no-shadow positive controls.