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>

docs/language/builtins/fn-print.md

@@ -5,8 +5,23 @@ category: builtins
 kind: builtin
 tokens: print
 sig: print(x)
-tip: Print an int or string, followed by a newline — for headless tests and debugging.
+tip: Print an int or string followed by a newline — for headless tests and debugging.
 order: 0
 ---
 
-Print an int or string, followed by a newline — for headless tests and debugging.
+Writes its argument to standard output followed by a newline. It accepts either an integer or a string, so it is the go-to tool for quick debugging and for headless test programs that emit numbers a test harness can check. It is a diagnostic channel, separate from anything drawn on screen with the <code>Screen</code> API, and is most useful in <code>Start</code>- or <code>Update</code>-phase handlers while you are iterating. For interpolated messages, build the string first with a backtick template and pass that.
+
+Parameters:
+- `x` — the value to print, an `int` or a string
+
+```ludic
+program PrintScore {
+  var score: int = 0
+
+  handler CountUp phase Update {
+    score = score + 10
+    print(score)
+    if score >= 30 { quit() }
+  }
+}
+```