Standardizes build process and adds OVERVIEW.md for each

Bomberman (U)/copilot/locals.inc

@@ -9,8 +9,18 @@ FrameSyncFlag          = $0B
 PpuCtrlShadow          = $0C
 PpuMaskShadow          = $0D
 
-; Controller sample consulted by main-loop and menu paths.
-ControllerState        = $12
+; Controller samples consulted by main-loop and menu paths.
+ControllerState1       = $12
+ControllerState2       = $13
+
+; NMI VRAM-transfer window: $14 indexes into the $0600 transfer table,
+; $15 is the upper limit compared against $14 to decide whether to keep
+; transferring or switch to the screen-state path.
+VramReadOffset         = $14
+VramWriteLimit         = $15
+
+; Selects which NMI sub-path is taken ($60=0 → sprite DMA; $60≠0 → VRAM data).
+NmiPathSelector        = $16
 
 ; Four-byte pseudo-random generator state used by AdvanceRandomState.
 RandomState0           = $54
@@ -18,13 +28,68 @@ RandomState1           = $55
 RandomState2           = $56
 RandomState3           = $57
 
+; Alternate random-state byte at $E4 (decremented at CPU $E71B; distinct from
+; RandomState0 which lives at $54 — zero-page is reused across subsystems).
+RandomStateAlt         = $E4
+
+; Main loop delay counters.
+MainDelay              = $70
+SubDelay               = $71
+
+; Screen / mode state.
+ScreenState            = $72
+GameMode               = $59
+
+; NMI work-pending flag: nonzero means the NMI should perform VRAM transfers.
+NmiWorkPending         = $60
+
+; Object coordinate / state temporaries used by gameplay object processing.
+ObjectScreenX          = $1F
+ObjectScreenY          = $20
+ObjectXLimit           = $73
+ObjectSpawnParam       = $28
+ObjectSpawnY           = $29
+ObjectSpawnX           = $2A
+ObjectSpawnWidth       = $2B
+ObjectSpawnHeight      = $2C
+ObjectStateFlags       = $5C
+ObjectStateTimer       = $5D
+ObjectStateExtra       = $5E
+
+; Frame counters and stage counters.
+FrameCounter           = $33
+StageCounter           = $93
+
+; Object work fields and bonus timer.
+ObjectWork0            = $9C
+ObjectWork1            = $9D
+ObjectWork2            = $9E
+ObjectWork3            = $9F
+BonusTimer             = $A4
+
+; Game mode counter and object type.
+GameModeCounter        = $B0
+ObjectType             = $B1
+FrameDelay             = $B5
+
+; Frame parity toggle (NMI toggles this each frame).
+FrameParity            = $DB
+
 ; General-purpose indirect pointer used by RAM clearing and transfer loops.
+; Aliased with sound dispatcher state below (zero-page is reused).
 IndirectPtrLo          = $E0
 IndirectPtrHi          = $E1
 
 ; Sound dispatcher and channel-delay state observed in the $E642 sound engine.
+; $E0/$E1 double as IndirectPtrLo/IndirectPtrHi; $E2/$E3 are dedicated delays.
 SoundCommandState      = $DF
-SoundDispatchIndex     = $E0
-SoundDelay0            = $E1
+SoundDispatchIndex     = $E0   ; aliases IndirectPtrLo
+SoundDelay0            = $E1   ; aliases IndirectPtrHi
 SoundDelay1            = $E2
 SoundDelay2            = $E3
+
+; Audio data pointers used by the sound engine.
+AudioPtrLo             = $AC
+AudioPtrHi             = $AD
+AudioArgLo             = $AE
+AudioArgHi             = $AF