Carry realm-owned exception tokens through the module tree, preserve V8 compile exceptions, and cache static dependency validation failures without caching direct import resolution or network errors. Keep values GC-traced and isolated across WindowProxy reuse.
Add identity, shared-dependency, realm, GC, and pending-sibling regressions. Validated with fmt, full workspace Clippy, 17647 nextest passes, and a matched 148-case CLI/CDP WPT slice. The target now passes 11/11 subtests; smoke is 42/43 with the baseline missing-node Puppeteer failure.
ldm0