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/screen/screen-draw_number.md

@@ -5,12 +5,34 @@ category: screen
 kind: namespace-method
 tokens: Screen.draw_number
 sig: Screen.draw_number(x, y, value, color, scale)
-tip: Draw an integer — no allocation, no string conversion.
+tip: Draw an integer directly, with no string allocation or conversion.
 order: 5
+ns: Screen
+member: draw_number
 ---
 
-Draw an integer — no allocation, no string conversion.
+Draws an integer as digits using the built-in font, without first turning it into a string — so it never allocates and is safe to call every frame for constantly-changing values. Use it for scores, timers, frame counts, health totals, and any HUD number, while reserving <code>Screen.draw_text</code> for fixed labels. It takes the same top-left position, color, and integer <code>scale</code> as <code>draw_text</code>. Negative values are drawn with a leading minus sign.
+
+Parameters:
+- `x` — the left edge of the first digit, in pixels
+- `y` — the top edge of the number, in pixels
+- `value` — the integer to draw
+- `color` — the digit color, e.g. a `Color.*` name or a `0xRRGGBB` literal
+- `scale` — integer size multiplier (`1` = native size)
 
 ```ludic
-Screen.draw_number(x: 52, y: 4, value: score, color: Color.Gold, scale: 1)
+program ScoreHud {
+  var score: int = 0
+
+  handler EarnPoints phase Update {
+    score = score + 1
+  }
+
+  handler DrawWorld phase Render {
+    Screen.clear(Color.MidnightBlue)
+    Screen.draw_text(x: 6, y: 4, text: "SCORE", color: Color.White, scale: 1)
+    Screen.draw_number(x: 52, y: 4, value: score, color: Color.Gold, scale: 1)
+    Screen.show()
+  }
+}
 ```