Add deps.sx spec: component dependency analysis
Canonical specification for per-page component bundling. Pure functions
for AST scanning, transitive closure, page bundle computation, and
per-page CSS class collection. deps.py becomes a thin host wrapper;
future hosts (Go, Rust, Haskell, etc.) bootstrap from this spec.
Defines 8 functions: scan-refs, scan-refs-walk, transitive-deps,
compute-all-deps, scan-components-from-source, components-needed,
page-component-bundle, page-css-classes.
Platform interface: component-body, component-name, component-deps,
component-set-deps!, component-css-classes, macro-body, env-components,
regex-find-all, scan-css-classes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
giles
6739343a06