dangernoodle-io / breadboard / 26770543106

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feat(bb_embed): bb_embed_site — embed a built-SPA dist dir + generate its served asset table (#326)

adds bb_embed_site() cmake helper that walks an entire built-SPA dist/ at configure
time, gzip-compresses every file, and emits a ready-to-serve bb_http_asset_t[] table
— eliminating the hand-maintained per-chunk embed lists that break when vite/rollup
code-splitting drifts the chunk count.

gen_site.py contract:
  - walks dist_dir recursively; deterministic (sorted) ordering
  - symbol = <table_sym>__<relpath sanitised to c identifier>
  - url: index.html at dist root → "/"; all others → "/<relpath>"
  - mime derived from file extension (11 types + octet-stream fallback)
  - encoding = "gzip" for every blob
  - emits one <symbol>.c blob per file via embed_html.embed_file()
  - emits <table_sym>_table.c: extern decls, mutable bb_http_asset_t[] table,
    const size_t <table_sym>_count, and idempotent accessor
    const bb_http_asset_t *<table_sym>_get(size_t *n)
  - accessor pattern mirrors bb_prov_default_form; mutable table (non-const)
    so .data/.len fill from extern blob symbols on first call; c99-portable
  - prints absolute .c paths to stdout (one per line) for cmake capture

cmake/bb_embed.cmake — new bb_embed_site(OUT_SRCS <v> TABLE <s> DIST_DIR <d>
  [URL_PREFIX <p>]): same inspection-pass guard and error handling as
  bb_embed_assets; registers CONFIGURE_DEPENDS via file(GLOB_RECURSE)

scripts/embed_html.py — extracted embed_file() importable entry point; progress
  message redirected to stderr when called as a library so cmake OUTPUT_VARIABLE
  receives only the generated .c paths

smoke coverage: examples/smoke/main/demo_site/ (index.html + assets/app.js +
  assets/style.css fixture); main/CMakeLists.txt calls bb_embed_site and adds
  ${_site_srcs} to idf_component_register SRCS; smoke_app.c calls demo_site_get()
  + bb_http_register_assets under #ifdef ESP_PLATFORM — proves codegen→C→link on
  every esp-idf board; arduino (uno_cc3000) is... (continued)

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