feat(stdlib): namespaced standard library (issue #2)

Implement the bulk of the namespaced-stdlib proposal (workshopsoft/ludic#2):
156 namespace methods across Math, Text, List, Ease, Collide, World, Net,
Sys, Save, Mem, extended Screen, Color functions, extended Random, and Time.
All deterministic fixed-point; self-hosting (C-free bootstrap fixpoint holds).

Compiler (selfhost/):
- Math.*: sqrt/sin/cos/tan/atan2/asin/acos (fixed-point runtime prelude —
  bit-by-bit isqrt, 256-entry interpolated sine table, Ross atan2), plus
  hypot/dist/dist2/deg_to_rad/rad_to_deg/posmod/wrap/ping_pong/snapped/
  move_toward/smoothstep/lerp/remap/sign/floor/ceil/round.
- Text.* (complete): upper/lower/trim/repeat/pad, split/join/replace,
  and the libc-backed queries.
- List.* (complete): insert/remove_at/remove/sort plus the earlier ops.
- Ease.* (in/out/in_out/back/bounce) and Collide.* (rects/point_rect/
  circles/rect_circle).
- Phase 3: World/Net/Sys/Save namespaced over the bare builtins (byte-
  identical IR) and Mem.* (bytes/words/copy/fill/peek/poke).
- Screen.* extended (line/circle/fill_circle/triangle/fill_triangle via new
  runtime primitives; sprite/sprite_scaled aliases), Color.* functions,
  Random.* (value/int/sign), Time.* (frame/delta/elapsed/now — new
  game-loop frame counter).
- Fix a lexer bug: fixed-point literals with >4 fractional digits overflowed.

Docs & tooling:
- 129 new per-symbol doc pages; gen.py made data-driven (namespaces
  discovered from the docs, no hardcoded list); new check-impl.py enforces
  that every implemented namespace method / keyword / type / phase has a
  doc page, wired into `x test-tools`. Document the previously-undocumented
  keywords (break/continue/where/entry/new/public + and/or/not tokens).
- LSP: namespaced signature help (ns_method_sig) covering every namespace.

Tests: 12 new self-host/regression tests + a golden render for the drawing
primitives. All suites green (selfhost 21, regression 45, tools 29).

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

tools/editors/vscode/src/extension.js

@@ -24,7 +24,7 @@ function resolveServer(folders) {
   const names = ['ludic-lsp', 'ludic-lsp.exe'];
   for (const folder of folders) {
     const root = folder.uri.fsPath;
-    for (const rel of ['build', 'tools/build', 'bin', '.']) {
+    for (const rel of ['bin', 'build', 'tools/build', '.']) {
       for (const name of names) {
         const p = path.join(root, rel, name);
         if (isExecutable(p)) return p;
@@ -45,8 +45,10 @@ function resolveCompiler(folders) {
   const configured = vscode.workspace.getConfiguration('ludic').get('compilerPath');
   if (configured) return expand(configured);
   for (const folder of folders) {
-    const p = path.join(folder.uri.fsPath, 'build', 'ludicc');
-    if (isExecutable(p)) return p;
+    for (const rel of ['bin', 'build']) {
+      const p = path.join(folder.uri.fsPath, rel, 'ludicc');
+      if (isExecutable(p)) return p;
+    }
   }
   return '';
 }
@@ -74,7 +76,7 @@ async function start(context) {
     // Not an error worth a modal: the grammar still highlights, and plenty of
     // people open a .ludic file without having built the toolchain.
     output.appendLine(
-      'ludic-lsp not found. Build it with tools/build-tools.sh, or set "ludic.server.path". ' +
+      'ludic-lsp not found. Build it with `bin/x tools`, or set "ludic.server.path". ' +
       'Syntax highlighting works without it; completion and diagnostics do not.'
     );
     return;