- 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>

# Conflicts:
# odoc-scrollycode-extension/src/scrollycode_extension.ml

Escape curly braces and fix odoc reference syntax to eliminate warnings
with (warnings fatal):
- Replace {dir}, {pkg}, {hash} etc with [dir], [<pkg>], [<hash>] or
{[ code blocks ]} as appropriate
- Fix {!Stdlib.Out_channel.with_open_gen} -> [Out_channel.with_open_gen]
in sherlodoc type_polarity.mli
- Fix @scrolly.<theme> -> [@scrolly.<theme>] in scrollycode extension
- Fix JSON format in findlibish.ml doc comment

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

Support files can now either embed inline string content (Inline) or
reference a file path on disk to copy (Copy_from). This enables large
binary-like files such as x-ocaml.js (~16MB) to be managed via
`odoc support-files` without embedding them as OCaml string literals.

The scrollycode extension's x-ocaml script URLs are now configurable
via ODOC_X_OCAML_JS and ODOC_X_OCAML_WORKER environment variables,
and ODOC_X_OCAML_JS_PATH registers the file as a Copy_from support file.

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

Three-layer architecture separating content, theme, and renderer:

Phase 1 — Scrollycode refactor:
- Strip ~1030 lines of embedded theme CSS from scrollycode_extension.ml
- Create scrollycode_css.ml with structural CSS using CSS custom properties
- Create scrollycode_themes.ml with three theme files (warm/dark/notebook)
registered as support files
- Simplify @scrolly tag: theme suffix now ignored (CSS concern, not content)
- Playground overlay styled via --xo-* custom properties on x-ocaml element

Phase 2 — Extra CSS support:
- Add --extra-css flag to odoc html-generate for injecting additional
<link> tags (used for per-page theme selection)

Phase 3 — Shell plugin system:
- Add Html_shell module with Shell interface and hashtable registry
- Register "default" shell in html_page.ml, "json" shell in
html_fragment_json.ml
- Replace hardcoded if/else in generator.ml with shell registry lookup
- Add --shell NAME flag (--as-json kept as backward-compat alias)

x-ocaml theming:
- Replace hardcoded colors in style.css with var(--xo-*, fallback)
covering editor, gutter, buttons, tooltips, and output areas
- CSS custom properties inherit through shadow DOM boundary, so
consumers theme x-ocaml with pure CSS — no JS injection needed

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