docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards

Rebuild the API Reference around one page per symbol and richer, verified content.

Pages & navigation
- One HTML page per symbol (kw-*, type-*, phase-*, screen-*, fn-*, annot-*, op-*)
  instead of a single scrolling page; namespace overview pages (ns-screen …
  ns-color) and a searchable index (api.html) with client-side fuzzy search.
- Sticky-header scroll offset (scroll-margin) so a jumped-to entry/param/color is
  never hidden, plus a flash highlight on the scrolled-to target.

Deep linking in every snippet & example
- Namespace members split: `Screen`→namespace page, `fill_rectangle`→method page;
  `Color`→palette page, `Charcoal`→its swatch — separately.
- Named arguments (`width:`) link to that parameter's anchor on the method page.
- Hover any token for a summary card built from the real API data (symbols.json).

Content & coverage
- Full authoritative surface documented from the compiler: every keyword, type,
  the 6 phases (Start/Input/FixedUpdate/Update/LateUpdate/Render, each its own
  page), all 22 annotations, namespace methods with parameter docs, builtins,
  the world_* reflection ABI, networking, operators — 155 symbols.
- Longer, clearer explanations; "model"/"model instance" terminology, not "entity";
  descriptive identifiers in every example (Position{column,row}, Velocity{delta_x,
  delta_y}, Health{current,maximum}, Player/Enemy) — no Pos/Seg/x/dx.
- Accuracy fixes from compiler ground-truth: world_count() takes no arg,
  world_query_next(property, cursor) arg order, event fields bind by name; dropped
  `when` and `module` (not in the self-hosted parser).

Tooling
- inventory.json + check.py: coverage guard (every symbol has a page), duplicate-
  token guard, and broken-link guard — fail CI so docs can't drift.
- validate.py: compiles every ```ludic example against bin/ludicc (158 compile).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/docgen/validate.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+"""Compile-validate every ```ludic example in the docs against the real ludicc.
+Full programs (start with program/module) compile directly; fragments are wrapped
+(as declarations, then as statements) like tools/check-docs.py. Reports failures."""
+import os, re, subprocess, tempfile, sys
+REPO=os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))); LC=os.path.join(REPO,"bin","ludicc")
+FENCE=re.compile(r"```ludic\n(.*?)\n```", re.S)
+DECL=("program","property","model","handler","enum","fn","extern","const","var","ui","event","module","import","scene","machine")
+
+def first_kw(body):
+    for l in body.split("\n"):
+        s=l.strip()
+        if s and not s.startswith("#"): return s.split("(")[0].split()[0].split("{")[0]
+    return ""
+
+def candidates(body):
+    kw=first_kw(body)
+    if kw in ("program","module"): return [body]
+    d="program DocCheck {\n"+body+"\n}\n"
+    s="program DocCheck {\n  handler DocS phase Start {\n"+body+"\n  }\n}\n"
+    return [d,s] if kw in DECL else [s,d]
+
+def compiles(src, full):
+    with tempfile.NamedTemporaryFile("w",suffix=".ludic",delete=False) as f:
+        f.write(src); tmp=f.name
+    flag=["--emit-llvm","-o",tmp+".ll"] if full else ["--fmt"]
+    r=subprocess.run([LC,tmp]+flag,capture_output=True)
+    os.unlink(tmp)
+    try: os.unlink(tmp+".ll")
+    except OSError: pass
+    return r.returncode==0, (r.stderr or b"").decode("utf-8","replace").strip().split("\n")[0]
+
+def files():
+    for base in ("docs/language","docs/site/snippets"):
+        for root,_,fs in os.walk(os.path.join(REPO,base)):
+            for fn in fs:
+                if fn.endswith(".md") or fn.endswith(".ludic"): yield os.path.join(root,fn)
+
+ok=fail=skip=0; fails=[]
+for p in files():
+    t=open(p).read()
+    blocks=FENCE.findall(t) if p.endswith(".md") else [t]
+    for b in blocks:
+        if 'import "' in b: skip+=1; continue
+        good=False; err=""
+        full = first_kw(b) in ("program","module")
+        for cand in candidates(b):
+            c,e=compiles(cand, full)
+            if c: good=True; break
+            if not err: err=e
+        if good: ok+=1
+        else: fail+=1; fails.append((os.path.relpath(p,REPO),err))
+print(f"examples: {ok} compile, {fail} fail, {skip} skipped (import)")
+for p,e in fails: print(f"  FAIL {p}: {e[:100]}")
+sys.exit(1 if fail else 0)