Filesystem routes, sections, dynamic segments; instant YES hero

The questions/ tree is the router now: ids derive from file paths
(index.yaml names its directory; explicit id still wins for legacy
content), actions and requires_chain accept relative refs, nested
non-index files infer followup, and _section.yaml applies qualifies/
requires_chain/responsible to everything under its directory. Dynamic
[name].yaml pages serve any /dir/<value> with the segment substituted
into {name} resource-key placeholders; submissions index their chain
node in a portal_chains KV so requires_chain pages can verify a
visitor's ?chain= lineage actually ends at the required question.
Loading uses one recursive git-trees call; question_lint walks
subdirectories the same way. Implements docs/design/filesystem-routes.md.

Also: the YES hero now starts at HTML parse time via an inline module
script (yes.js moved to public/ for a stable /yes.js the wasm binding
raw_module-imports too - snippet paths are per-build-hashed), with
hydration adopting the running instance; and both gesture containers
reserve their box in CSS so mounting doesn't shift content.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/bin/question_lint.rs

@@ -108,23 +108,38 @@ fn load_aggregates_from_dir(
 }
 
 /// The offline counterpart to `content::load_questions_from_gitea` -
-/// same "every `*.yaml` file becomes a `Question` keyed by its own
-/// `id`" shape, just reading a local checkout instead of Gitea's API,
+/// the same recursive tree walk and `content::build_questions`
+/// pipeline (derived ids, relative refs, sections, followup
+/// inference), just reading a local checkout instead of Gitea's API,
 /// for linting a branch that hasn't been pushed yet.
 fn load_from_dir(
     dir: &str,
 ) -> anyhow::Result<std::collections::HashMap<String, content::Question>> {
-    let mut out = std::collections::HashMap::new();
+    let base = std::path::Path::new(dir);
+    let mut files = Vec::new();
+    collect_yaml(base, base, &mut files)?;
+    content::build_questions(&files)
+}
+
+fn collect_yaml(
+    base: &std::path::Path,
+    dir: &std::path::Path,
+    out: &mut Vec<(String, String)>,
+) -> anyhow::Result<()> {
     for entry in std::fs::read_dir(dir)? {
-        let entry = entry?;
-        let path = entry.path();
-        if path.extension().and_then(|e| e.to_str()) != Some("yaml") {
-            continue;
+        let path = entry?.path();
+        if path.is_dir() {
+            collect_yaml(base, &path, out)?;
+        } else if path.extension().and_then(|e| e.to_str()) == Some("yaml") {
+            let rel = path
+                .strip_prefix(base)
+                .expect("walked paths sit under their base")
+                .to_string_lossy()
+                .replace('\\', "/");
+            let raw = std::fs::read_to_string(&path)
+                .map_err(|e| anyhow::anyhow!("reading {}: {e}", path.display()))?;
+            out.push((rel, raw));
         }
-        let raw = std::fs::read_to_string(&path)?;
-        let question: content::Question = serde_yaml::from_str(&raw)
-            .map_err(|e| anyhow::anyhow!("parsing {}: {e}", path.display()))?;
-        out.insert(question.id.clone(), question);
     }
-    Ok(out)
+    Ok(())
 }