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/events/kw-emit.md

@@ -4,9 +4,31 @@ name: emit
 category: events
 kind: keyword
 tokens: emit
-sig: emit Name(field: v)
-tip: Fire an event, invoking its listeners.
+sig: emit Name(field: value)
+tip: Fire an event, running every listener; as an expression it yields the veto flag.
 order: 1
 ---
 
-Fire an event, invoking its listeners. As an expression it yields a cancellable event's cancelled flag.
+`emit Name(field: value, …)` fires an event: it runs every `@On(Name)` listener in declaration order, passing the named payload fields (any you omit take the event's declared defaults). It desugars to a direct call into the event's generated function, so firing an event is as cheap as calling a function. For a `cancellable` event, `emit` can be used as an <b>expression</b> that yields the cancelled flag — `0` if no listener vetoed, `1` if one did — which is the "check the decision before acting" shape: apply the effect only when the emit returns `0`.
+
+```ludic
+program EmitExample {
+  event cancellable BeforeSpend { amount: int = 0 }
+
+  var coins: int = 50
+
+  @On(BeforeSpend) handler RejectOverdraft { if amount > coins { cancel } }
+
+  handler TrySpend phase Update {
+    if Input.key() == 'b' {
+      if emit BeforeSpend(amount: 20) == 0 { coins = coins - 20 }
+    }
+  }
+
+  handler DrawWorld phase Render {
+    Screen.clear(Color.MidnightBlue)
+    Screen.draw_number(x: 4, y: 4, value: coins, color: Color.Gold, scale: 1)
+    Screen.show()
+  }
+}
+```