Merge train: #9944, #9945, #9946, #9947, #9948

[proggeramlug]

Merge train: #9944, #9945, #9946, #9947, #9948. All five cherry-picked without a conflict.

#9946 — a class-identity bug with a real victim

A function-local class Definition extends Error {} produces a fresh class object on every evaluation but shares a single compile-time class id. The class registry is keyed by that id and is necessarily last-wins, so a constructor factory that later evaluates the same declaration with an Object parent retroactively broke instanceof Error for instances created earlier. Zod's $constructor has exactly that shape: a ZodError failed instanceof Error while getPrototypeOf still reported ZodError → Error → Object.

Two prototype-resolution paths disagreeing about one chain is a known weak area here, and the fix takes the right side of it — the instance's recorded evaluation prototype is authoritative over the shared-id registry entry.

The rest

• fix(module): synchronize named builtin exports #9944 synchronizes named builtin exports across the HIR lowering and the runtime's native-module table, with tests on both sides.
• fix(fs): expose embedded asset metadata #9945 exposes embedded-asset metadata through fs stats and dirents.
• feat(diagnostics): capture Linux server hangs outside the event loop #9947 adds a Linux hang collector plus its own fixtures, wired into test.yml as an additive step under !cancelled() — appropriate for a diagnostic self-check, and its failure would be its own rather than masking anything. Its fixtures pass locally.
• test(drizzle): stress SQL prefixes across garbage collection #9948 is a Drizzle SQL-prefix GC stress package — coverage for the bug class this queue has been producing rather than a fix for one.

Validation

run_lint_gates: all 67 gates passed; 2 CI-only skipped (67 — #9947 adds one)

suite	passed	failed
perry-runtime	3265	0
perry-codegen	1941	0
perry-hir	630	0
perry-stdlib	132	0