Promote Joypad Test Cartridge (U) from _wip to top-level project

Moves Joypad Test Cartridge (U) from _wip/ to Joypad Test Cartridge (U)/ with full ROM build:
- Adds header.s, chr.s, linker.cfg (HEADER+PRG+CHR segments)
- Updates Makefile to build and verify reconstructed.nes vs rom.nes
- Adds rom.nes copy + copilot/rom.nes symlink per repo convention
- Verified byte-identical build

Pass 1 complete: full code/data classification (~3.5% code / ~96.5% data)
Pass 2 complete: routine headers for all labels, semantic naming for key
routines (Reset, NmiHandler, VramWrite, PpuScrollLatch, VramPtrWrite,
RetAddrUpdate, etc.), zero-page aliases in locals.inc

Root OVERVIEW.md updated:
- Removes Joypad Test Cartridge from _wip skeleton table (22 -> 21 skeletons)
- Adds Joypad Test Cartridge as #14 in numbered inventory (BYTE-IDENTICAL, Pass 2)
- Updates summary count from 13 to 14 projects

Joypad Test Cartridge (U)/copilot/reconstructed.lbl

@@ -0,0 +1,35 @@
+al 00CE89 .Label_CE89
+al 00CE6E .Label_CE6E
+al 00CE5F .Label_CE5F
+al 00CE8A .Label_CE8A
+al 00CE4F .VramBurstWrite
+al 00CE3C .PpuScrollLatch
+al 00CE33 .Label_CE33
+al 00CE39 .Label_CE39
+al 00CE16 .Label_CE16
+al 00CE12 .Label_CE12
+al 00CDEE .VramWrite
+al 00CDC8 .RetAddrUpdate
+al 00CDB1 .Label_CDB1
+al 00CDA3 .Label_CDA3
+al 00CD99 .VramPtrTableRead
+al 00CD8D .Label_CD8D
+al 00CD74 .Label_CD74
+al 00CD71 .Label_CD71
+al 00CD6E .Label_CD6E
+al 00CD69 .Label_CD69
+al 00CD5C .Label_CD5C
+al 00CD45 .VramWriteLoop
+al 00CD3F .VramPtrWrite
+al 00CD2F .PpuMaskSetup
+al 00CD24 .OamDmaSetup
+al 00CD17 .PpuCtrlSetup
+al 00CD0A .NmiContinue
+al 00CCF7 .NmiHandler
+al 00C178 .Label_C178
+al 00C174 .ClearOAM_Routine
+al 00C05D .ClearRAM2_Loop
+al 00C013 .ClearRAM1_Loop
+al 00C00A .WaitVblank3
+al 00C005 .WaitVblank2
+al 00C000 .Reset