fix(codegen): route map parameter methods by type

[luisleo526]

Summary

• route typed-map UDF parameter methods through the existing map lowering by lexical TypeSpec
• merge positional/keyword arguments into signature order for this new lane
• bind key/value expressions once with deterministic key-before-value order
• preserve reference aliasing and existing global/local/namespace positional output byte-for-byte

Regression coverage

• put/get/remove/contains/size/clear/keys/values/copy/put_all
• float/int/bool/string value types and missing-key compatibility behavior
• caller-visible put/remove/clear/put_all mutation
• global array/map/matrix name shadowing
• helper-token collisions, nested calls, and the public UDT-map rejection boundary

Verification

• focused: 4/4
• full pinned-engine pytest: 1,708 passed / 2 skipped
• native/Pyodide differential: 277/277
• exact frozen 666-source manifest: byte-identical to base at 26ff05c3...a7e
• independent adversarial review: approved; no scoped blocker
• git diff --check: clean

Explicitly separate residuals

This PR fixes dispatch, not all map semantics. It does not change ordinary map keyword failures, terminal UDF collection/void return inference, or the shared map put/get/remove/put_all/insertion-order behavior. Those remain separate follow-up factors against the TradingView v6 map contract.