feat(3d): gl1 shim M0-M2 — FFP-on-WebGL2 substrate + lighting; 12 scenarios truly green

wasm/gl1: the GL1.x fixed-function emulation layer replacing the
gl_ffp_stub.c no-ops in the 3d-regression harness link. This batch:

- symbol split: 52 FFP-only entry points implemented; 10 Emscripten-owned
  names intercepted via wasm-ld --wrap (sources.txt/wrapped_symbols.txt are
  the shared manifests for both link sites; production hookup lands in M7)
- matrix stacks (MODELVIEW/PROJECTION, glGetFloatv readback), immediate
  mode with all 8 GL1 primitive conversions, GL1-default state mirror
- full GL 1.5 Gouraud lighting uber-shader (eye-space light capture at
  glLightfv time, color-material, two-side, COMBINE evaluator + alpha test
  wired but inert until M3/M5)
- draw routing: FFP traffic identified by GL_VERTEX_ARRAY client state;
  blit/2D-GAL draws pass through untouched
- display lists: correct glGenLists/glIsList existing-empty semantics;
  recorder itself is M3 (recorded commands drop with a one-time warning)

Parity: 20/47 under the 0.02 floor, of which 12 verified genuinely
rendering (bg-gradient x2, bounding-box, half-open-cylinder, segment x2,
material x3, light x3 — eyeballed against baselines); the other 8 are
small-geometry scenarios whose missing GLU/display-list content sits under
the floor (become real in M3/M4).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

wasm/gl1/wrapped_symbols.txt

@@ -0,0 +1,10 @@
+glEnable
+glDisable
+glIsEnabled
+glDrawArrays
+glDrawElements
+glGetFloatv
+glBindTexture
+glBlendFunc
+glLineWidth
+glHint