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/docgen/inventory.json

@@ -50,6 +50,20 @@
     "fn-file_stdout",
     "fn-file_stderr"
   ],
+  "collide": [
+    "collide-rects",
+    "collide-point_rect",
+    "collide-circles",
+    "collide-rect_circle"
+  ],
+  "color": [
+    "color-rgb",
+    "color-rgba",
+    "color-lerp",
+    "color-darken",
+    "color-lighten",
+    "color-with_alpha"
+  ],
   "control": [
     "kw-if",
     "kw-while",
@@ -60,6 +74,13 @@
     "kw-state",
     "kw-become"
   ],
+  "ease": [
+    "ease-in",
+    "ease-out",
+    "ease-in_out",
+    "ease-back",
+    "ease-bounce"
+  ],
   "ecs": [
     "kw-spawn",
     "kw-despawn",
@@ -95,11 +116,77 @@
   "input": [
     "input-key"
   ],
+  "list": [
+    "list-len",
+    "list-push",
+    "list-clear",
+    "list-first",
+    "list-last",
+    "list-pop",
+    "list-swap",
+    "list-contains",
+    "list-index_of",
+    "list-reverse",
+    "list-insert",
+    "list-remove_at",
+    "list-remove",
+    "list-sort"
+  ],
   "map": [
     "map-size",
     "map-row",
     "map-tile"
   ],
+  "math": [
+    "math-min",
+    "math-max",
+    "math-abs",
+    "math-clamp",
+    "math-sign",
+    "math-floor",
+    "math-ceil",
+    "math-round",
+    "math-lerp",
+    "math-inverse_lerp",
+    "math-remap",
+    "math-sqrt",
+    "math-sin",
+    "math-cos",
+    "math-tan",
+    "math-hypot",
+    "math-dist",
+    "math-dist2",
+    "math-deg_to_rad",
+    "math-rad_to_deg",
+    "math-posmod",
+    "math-wrap",
+    "math-ping_pong",
+    "math-snapped",
+    "math-move_toward",
+    "math-smoothstep",
+    "math-atan2",
+    "math-asin",
+    "math-acos"
+  ],
+  "mem": [
+    "mem-bytes",
+    "mem-words",
+    "mem-copy",
+    "mem-fill",
+    "mem-peek",
+    "mem-poke"
+  ],
+  "net": [
+    "net-send",
+    "net-poll",
+    "net-serialize",
+    "net-apply",
+    "net-owner",
+    "net-set_owner",
+    "net-is_server",
+    "net-is_owner",
+    "net-local_id"
+  ],
   "networking": [
     "fn-net_send",
     "fn-net_poll",
@@ -134,7 +221,14 @@
   "random": [
     "random-range",
     "random-chance",
-    "random-seed"
+    "random-seed",
+    "random-value",
+    "random-int",
+    "random-sign"
+  ],
+  "save": [
+    "save-write",
+    "save-read"
   ],
   "scenes": [
     "kw-scene",
@@ -154,7 +248,14 @@
     "screen-show",
     "screen-width",
     "screen-height",
-    "screen-status"
+    "screen-status",
+    "screen-line",
+    "screen-circle",
+    "screen-fill_circle",
+    "screen-triangle",
+    "screen-fill_triangle",
+    "screen-sprite",
+    "screen-sprite_scaled"
   ],
   "structure": [
     "kw-program",
@@ -172,6 +273,50 @@
     "kw-ui",
     "kw-enum"
   ],
+  "sys": [
+    "sys-arg",
+    "sys-arg_count",
+    "sys-exit",
+    "sys-run",
+    "sys-env",
+    "sys-read_char",
+    "sys-file_open",
+    "sys-file_read",
+    "sys-file_write",
+    "sys-file_seek",
+    "sys-file_tell",
+    "sys-file_close",
+    "sys-stdout",
+    "sys-stderr"
+  ],
+  "text": [
+    "text-length",
+    "text-char_at",
+    "text-slice",
+    "text-starts_with",
+    "text-ends_with",
+    "text-contains",
+    "text-index_of",
+    "text-equals",
+    "text-concat",
+    "text-to_int",
+    "text-from_int",
+    "text-upper",
+    "text-lower",
+    "text-trim",
+    "text-repeat",
+    "text-pad_left",
+    "text-pad_right",
+    "text-split",
+    "text-join",
+    "text-replace"
+  ],
+  "time": [
+    "time-frame",
+    "time-delta",
+    "time-elapsed",
+    "time-now"
+  ],
   "types": [
     "type-bool",
     "type-byte",
@@ -185,5 +330,23 @@
     "type-str",
     "type-void",
     "type-words"
+  ],
+  "world": [
+    "world-get",
+    "world-set",
+    "world-has",
+    "world-count",
+    "world-size",
+    "world-spawn",
+    "world-save",
+    "world-load",
+    "world-prop_id",
+    "world-field_id",
+    "world-model_id",
+    "world-kind",
+    "world-register_prop",
+    "world-attach",
+    "world-detach",
+    "world-query_next"
   ]
 }