Reify Number and String static function values

[andrewtdiz]

Refs #4627

Summary:

• Reifies captured Number.isInteger / Number.isSafeInteger value reads so they expose callable functions with Node-shaped .name/.length metadata.
• Installs String.fromCharCode / String.fromCodePoint / String.raw constructor static closures and keeps direct-call fast paths intact.
• Adds focused globals parity coverage for metadata descriptors, direct calls, detached calls, and adjacent Number.parseInt / Number.isNaN invariants.

Why batched:

• These are the remaining Number/String sibling cases of the built-in constructor static function-value metadata gap after Date landed and Array is covered by the separate open PR fix(runtime): Array.isArray/from/of usable as first-class function values #4626.
• They share the same constructor-static reification and HIR reroute exception path.

Tests:

• Added test-parity/node-suite/globals/number-string-static-values.ts.

Validation:

• Focused globals parity: --filter number-string-static-values (1 pass / 0 fail / 0 compile fail).
• Direct Node 22 and Node 26 fixture diffs matched Perry output.
• Adjacent direct no-auto diffs matched Node for builtin-namespace-method-values and builtin-constructor-own-name-length.
• cargo fmt --all -- --check
• cargo check -p perry-hir -p perry-runtime
• ./scripts/check_file_size.sh
• git diff --check

Known limitations:

• The existing builtin-name-length-descriptors fixture still exits under Node due ESM strict assignment to a read-only function name, so it was not used as a passing adjacency check.

Non-goals:

• No Array static changes; open PR fix(runtime): Array.isArray/from/of usable as first-class function values #4626 covers that sibling.
• No Date static changes; fix(runtime): Date.now/parse/UTC usable as first-class function values #4622 already landed.
• No broad constructor/static rewrite or changes to Number.parseInt / Number.isNaN fast paths.

[proggeramlug]

Superseded: every Number/String static this reifies (isInteger, isSafeInteger, fromCharCode, fromCodePoint, raw) already landed on main via #4627 — both the HIR gate and runtime installs. No new methods here. Thanks @andrewtdiz!