fix(codegen): route array parameter methods by type

[luisleo526]

Summary

• route array-typed UDF parameter method receivers through the existing array lowering by parameter TypeSpec
• give parameter TypeSpecs lexical precedence over same-named global collection registries
• preserve existing namespace/global/local/arbitrary receiver output byte-for-byte

Regression coverage

• positional and keyword array.percentrank on typed parameters
• checked read/mutation methods across float, int, bool, string, and UDT elements
• caller-visible mutation aliasing and receiver/index/value one-evaluation order
• same-name global array/map/matrix shadowing probes
• compile smoke for parameter method lowering

Verification

• focused committed tests: 3/3
• affected files: 96/96
• full engine-enabled pytest against pinned public engine: 1,704 passed / 2 skipped
• native/Pyodide differential: 277/277
• exact frozen 666-source manifest: byte-identical to base at 26ff05c3...a7e (660 OK / same 6 errors)
• independent review: approved; no scoped blocker
• git diff --check: clean

Explicitly separate residuals

• typed map/matrix parameter keyword dispatch
• generic UDF collection/element return inference
• user extension methods on array<T>