[mikolas]

Summary

Implements live Amiberry GDB Remote Serial Protocol (RSP) snapshot initialization (hunks init --gdb) and snapshot-seeded static + trace analysis (hunks -m <mod> analyze --trace).

Key Additions

• internal/gdb: Pure-Go GDB RSP client (Dial, WaitProcessBreak, ReadRegisters, chunked 16 KiB ReadMemory, ReadCustomSnapshot, MemoryMap JSON + XML fallback, Segments, Detach).
• internal/amiga/custom_snapshot.go: CustomSnapshot ([512]byte) decoder for Amiberry's $DFF000–$DFF1FF save_custom aperture (DMACON, INTENA, INTREQ, ADKCON, COP1LC, COP2LC, BPLPT, BPLCON0..2, BPL1MOD/BPL2MOD, SPRPT, Palette12, SummaryMap).
• internal/project: SnapshotState in project.json storing captured CPU registers (D0..D7, A0..A7, PC, SR), custom.bin, and custom_info.
• internal/analyzer:
  • SeedFromSnapshot: statically seeds Entry_PC, zero-page exception/IRQ vectors ($64..$BC), stack return addresses (A7 pointing after BSR/JSR), $DFF000 base-register invariants, and COP1LC/COP2LC/BPLxPT/SPRxPT labels.
  • RunTrace & Chipset.LoadCustomSnapshot: preloads CPU registers, chipset registers, and multi-segment RAM (chip + $C00000 slow Ranger RAM) so analyze --trace resumes directly from the captured machine state.
• internal/tui: BitplaneState.ApplyCustomSnapshot pre-populates BPLxPT, BPLCON0, BPL1MOD, and COLOR00..31 when opening the Bitplane Viewer (B).

Testing

• go build ./... && go vet ./... && go test -count=1 ./...
• Ready for end-to-end live testing against Amiberry (gdb_server=true).