- Remove 12 JS stubs from js_top_worker that are already provided by
basement/runtime.js and base/runtime.js (blocking_mutex, blocking_condition,
thread_yield, basement_dynamic, basement_alloc_stack_bind, caml_ml_domain_index)
- Keep caml_make_local_vect as it's needed by OxCaml compiler-libs and base
is not a transitive dependency
- Fix free-variables warnings by using proper //Provides/Requires pattern
for domain TLS shared state
- Add (link_flags (-linkall)) to odoc-scrollycode-extension test binary so
Html_page's side-effect shell registration is linked (matches real odoc binary)
- Promote test expected outputs for OCaml 5.4.1 and scrollycode extension changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Consolidate js_top_worker and odoc dual-compiler stanzas into single
library stanzas with cppo rules generating impl.ml from impl.cppo.ml
- Per-package findlib_index.json with relative universe paths (../dep)
and implicit stdlib dependency injection
- Add find_stdlib_dcs to Impl.S interface for stdlib CMI lookup via
findlib metadata instead of hardcoded URLs
- Replace jsoo Json.output/Json.unsafe_input with plain JSON.stringify/
JSON.parse for cross-jsoo-version compatibility (6.0.1+ox vs 6.2.0)
- Cross-origin worker support: set __global_rel_url in blob worker,
skip URL rewriting for absolute http(s) URLs
- Fix odoc doc comments and ocamlformat-ignore for cppo files
- Add demo docs, helper scripts, and x-ocaml package-lock.json

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>