Include marginalia modules in HTML cache version digest

Editing src/marginalia.py (figure registry, attachments) or
src/marginalia_grammar.py (Canvas grammar) changes runtime HTML output,
but they were absent from html_version()'s content_paths. The Worker's
in-memory HTML cache would serve stale figures after a deploy. Add both
files to the digest so the cache version moves whenever either changes.

Verified: a probe edit to src/marginalia.py now flips HTML_CACHE_VERSION;
removing the probe restores it.

https://claude.ai/code/session_01MazwoRWAihW6dwso3fMCHE

Author: claude

scripts/fingerprint_assets.py

@@ -41,6 +41,8 @@ def html_version(paths: dict[str, str]) -> str:
         ROOT / "src" / "examples.py",
         ROOT / "src" / "example_loader.py",
         ROOT / "src" / "example_sources_data.py",
+        ROOT / "src" / "marginalia.py",
+        ROOT / "src" / "marginalia_grammar.py",
         ROOT / "src" / "example_sources" / "manifest.toml",
         *sorted((ROOT / "src" / "example_sources").glob("*.md")),
         *sorted((ROOT / "src" / "templates").glob("*.html")),

src/asset_manifest.py

@@ -1,3 +1,3 @@
 # Generated by scripts/fingerprint_assets.py. Do not edit by hand.
 ASSET_PATHS = {'SITE_CSS': '/site.5ef8f1332e43.css', 'SYNTAX_JS': '/syntax-highlight.3b6c7f730d46.js', 'EDITOR_JS': '/editor.dd81f5171b14.js'}
-HTML_CACHE_VERSION = '6de2b0323aeb'
+HTML_CACHE_VERSION = '2b27886b2818'