feat(wasm): kicad_editor — merge the pcbnew+eeschema kifaces into ONE bundle (Part 2)

All four editors (PCB / Footprint / Schematic / Symbol) are now runtime --frame
choices of a single kicad_editor.wasm (178 MB at -O1 vs 147+82 separate; shared
wx/common/boost linked once). One editor per page load, as before; frames pcb /
fpedit / sch / symedit.

- wasm/editor/: the merged executable target (single_top + both kiface library sets,
  whole-archive pcbcommon) + the safety-net focus-walk Kiface() dispatch TU. Gated by
  KICAD_WASM_MERGED_EDITOR (kicad submodule bump carries the fork side: per-engine
  Kiface/getter binding + ODR renames + dual-kiface launcher).
- wasm/bindings/: per-editor collab entries renamed pcbCollab*/schCollab* (JS names
  unchanged); duplicate kicadOpenFile/kicadCollabOnSave + shared-name registrations
  guarded behind KICAD_MERGED_EMBIND; new kicad_editor_embind.cpp registers each
  shared JS name once, dispatching on the live frame.
- Build: kicad_editor app (build wrapper, target case arms, 3-object embind compile
  with the ABI-critical flags, STUB_APP=pcbnew); docker/build.sh "all" =
  kicad_editor calculator pl_editor gerbview (pcbnew/eeschema stay as explicit debug
  apps); scripts/kicad/audit-merged-symbols.sh = repeatable ODR-collision audit (run
  on kicad bumps).
- Frontend: Bundle type (bundle ≠ tool); TOOL_BUNDLE maps all four editors to
  kicad_editor; explicit --frame tokens for pcbnew (pcb) and eeschema (sch); publish
  list = the 4 real bundles.
- Tests/CI: five harnesses load kicad_editor.js with explicit frame tokens;
  PCBNEW_FAMILY_SPECS renamed BIG_MODULE_SPECS + the 8 eeschema-family specs (they
  now boot the merged module — SpiderMonkey x86 CI OOM routing); frame-runtime spec
  covers all four frames from the one bundle.

Validated so far: frame-runtime 4/4 (each frame boots with the right title, no
aborts, no duplicate embind registration); 24-spec merged-module regression green;
3D raytracer renders. Known pre-existing failure: 3d-viewer title-bar drag deadlock,
fixed on main by 7630c7e (2N+8 pthread pre-warm) — picked up by the follow-up rebase.

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

tests/apps/kicad/eeschema.html

@@ -154,6 +154,11 @@
     var Module = {
       thisProgram: '/usr/bin/eeschema',  // Fake absolute path for argv[0] (KiCad DEBUG check)
 
+      // The schematic editor is served by the merged kicad_editor bundle (editor-
+      // unification Part 2): load kicad_editor.js below and select FRAME_SCH at
+      // runtime.
+      arguments: ['--frame=sch'],
+
       preRun: [createCanvas, writeResources, seedKicadConfig],
       postRun: [],
 
@@ -209,6 +214,7 @@
   <!-- wxWidgets WASM glue code (defines getConfigEntryLength, etc.) -->
   <script src="wx.js"></script>
   <script src="wx-dom.js"></script>
-  <script async src="eeschema.js"></script>
+  <!-- Schematic editor = merged kicad_editor bundle + --frame=sch (editor-unification Part 2). -->
+  <script async src="kicad_editor.js"></script>
 </body>
 </html>

tests/apps/kicad/footprint_editor.html

@@ -108,8 +108,9 @@
     var Module = {
       thisProgram: '/usr/bin/footprint_editor',  // argv[0] for KiCad's DEBUG check
 
-      // The footprint editor is served by the pcbnew bundle (editor-unification):
-      // load pcbnew.js below and select FRAME_FOOTPRINT_EDITOR at runtime.
+      // The footprint editor is served by the merged kicad_editor bundle (editor-
+      // unification Part 2): load kicad_editor.js below and select
+      // FRAME_FOOTPRINT_EDITOR at runtime.
       arguments: ['--frame=fpedit'],
 
       preRun: [createCanvas, writeResources, seedKicadConfig],
@@ -147,7 +148,7 @@
   <!-- wxWidgets WASM glue code (defines getConfigEntryLength, etc.) -->
   <script src="wx.js"></script>
   <script src="wx-dom.js"></script>
-  <!-- Footprint editor = pcbnew bundle + --frame=fpedit (editor-unification). -->
-  <script async src="pcbnew.js"></script>
+  <!-- Footprint editor = merged kicad_editor bundle + --frame=fpedit (editor-unification Part 2). -->
+  <script async src="kicad_editor.js"></script>
 </body>
 </html>

tests/apps/kicad/pcbnew-collab.html

@@ -158,6 +158,11 @@
     var Module = {
       thisProgram: '/usr/bin/pcbnew',  // Fake absolute path for argv[0] (KiCad DEBUG check)
 
+      // The PCB editor is served by the merged kicad_editor bundle (editor-
+      // unification Part 2): load kicad_editor.js below and select
+      // FRAME_PCB_EDITOR at runtime.
+      arguments: ['--frame=pcb'],
+
       preRun: [createCanvas, writeResources, seedKicadConfig],
       postRun: [],
 
@@ -213,6 +218,7 @@
   <!-- wxWidgets WASM glue code (defines getConfigEntryLength, etc.) -->
   <script src="wx.js"></script>
   <script src="wx-dom.js"></script>
-  <script async src="pcbnew.js"></script>
+  <!-- PCB editor = merged kicad_editor bundle + --frame=pcb (editor-unification Part 2). -->
+  <script async src="kicad_editor.js"></script>
 </body>
 </html>

tests/apps/kicad/pcbnew.html

@@ -123,6 +123,11 @@
     var Module = {
       thisProgram: '/usr/bin/pcbnew',  // Fake absolute path for argv[0] (KiCad DEBUG check)
 
+      // The PCB editor is served by the merged kicad_editor bundle (editor-
+      // unification Part 2): load kicad_editor.js below and select
+      // FRAME_PCB_EDITOR at runtime.
+      arguments: ['--frame=pcb'],
+
       preRun: [createCanvas, writeResources],
       postRun: [],
 
@@ -178,6 +183,7 @@
   <!-- wxWidgets WASM glue code (defines getConfigEntryLength, etc.) -->
   <script src="wx.js"></script>
   <script src="wx-dom.js"></script>
-  <script async src="pcbnew.js"></script>
+  <!-- PCB editor = merged kicad_editor bundle + --frame=pcb (editor-unification Part 2). -->
+  <script async src="kicad_editor.js"></script>
 </body>
 </html>

tests/apps/kicad/symbol_editor.html

@@ -147,8 +147,9 @@
     var Module = {
       thisProgram: '/usr/bin/symbol_editor',  // Fake absolute path for argv[0] (KiCad DEBUG check)
 
-      // The symbol editor is served by the eeschema bundle (editor-unification):
-      // load eeschema.js below and select FRAME_SCH_SYMBOL_EDITOR at runtime.
+      // The symbol editor is served by the merged kicad_editor bundle (editor-
+      // unification Part 2): load kicad_editor.js below and select
+      // FRAME_SCH_SYMBOL_EDITOR at runtime.
       arguments: ['--frame=symedit'],
 
       preRun: [createCanvas, writeResources, seedKicadConfig],
@@ -206,7 +207,7 @@
   <!-- wxWidgets WASM glue code (defines getConfigEntryLength, etc.) -->
   <script src="wx.js"></script>
   <script src="wx-dom.js"></script>
-  <!-- Symbol editor = eeschema bundle + --frame=symedit (editor-unification). -->
-  <script async src="eeschema.js"></script>
+  <!-- Symbol editor = merged kicad_editor bundle + --frame=symedit (editor-unification Part 2). -->
+  <script async src="kicad_editor.js"></script>
 </body>
 </html>