fix(hir): class static blocks run at class-decl source position

[proggeramlug]

Summary

A class static { ... } block runs as part of class evaluation in source order per ES spec — right after that class's static-field initializers, BEFORE any code that follows the class declaration. Perry hoists classes, so the codegen-side init_static_fields_late loop ran every block at the end of module init, after all user top-level statements had executed.

So:

class A { static { A.flag = true; } }
console.log(A.flag);    // node: true   perry: false (block ran LAST)

Fix: in lower/stmt.rs when walking a class decl in the module body, push a StaticMethodCall for each synthetic __perry_static_init_N method right after that class's static-field-init stmts. The block now runs at the spec-correct point in module.init. The codegen fallback in init_static_fields_late is kept (skipping blocks already invoked via the init stream) so class expressions that bypass the stmt-decl path still get their blocks invoked.

Repros (after fix, byte-identical with Node)

$ ./perry compile static.ts -o /tmp/s && /tmp/s
(1) initialized: true
(2) A.n: 10
(3) D.x: 1 D.y: 2
(4) C.both: 30

Where static.ts is the new test-files/test_gap_class_static_blocks.ts covering: declared-only static field set in a block, source-order ordering against static x = 0, multiple blocks in one class, cross-class read.

Scope

• crates/perry-hir/src/lower/stmt.rs: inline StaticMethodCall per __perry_static_init_* after the class's static-field-inits.
• crates/perry-codegen/src/codegen/helpers.rs: in init_static_fields_late, skip blocks already invoked via the init stream (detected by a top-level Expr(StaticMethodCall { class, method, .. }) matching the synthetic name).
• test-files/test_gap_class_static_blocks.ts: new parity test (above).
• test-parity/known_failures.json: drop test_gap_class_advanced — its static block initialized: true diff was the only divergence and is now byte-identical with Node.

Test plan

• cargo fmt --all -- --check
• cargo test --release -p perry-codegen -p perry-hir
• diff <(node --experimental-strip-types test_gap_class_static_blocks.ts) <(./perry compile ... && /tmp/out) — empty
• diff <(node --experimental-strip-types test_gap_class_advanced.ts) <(./perry compile ... && /tmp/out) — empty (was the static block initialized line before fix)

[proggeramlug]

Note: rebased against main, which now pins this exact bug as #2278 (the static-block sub-case bisected out of #1635 by #2279). This PR closes #2278.