Recovers the Apr 23 hand-edit (lost in subsequent refactors) and re-wires
it as a TOML midasm hook so codegen regeneration can no longer drop it.
Hook fires immediately after the guest decompressor (bl 0x822CF510)
returns, reads the entry record via r11 (codec at +1, csize at +8,
usize at +12), source offset from *(r31+22888), entry tag from r10, and
calls Ac6DumpPacDecodedEntry with the decoded buffer at r4. With
AC6_DUMP_PAC_DECODED=1, all 800 compressed entries now drop as
FHM-magic'd entry_*_mode1_*.bin in out/ac6_pac_runtime_dump/.
Also adds streamer-worker dispatch probes (AC6_TRACE_PAC_WORK_ITEMS),
PPC stack walking on PAC reads (AC6_TRACE_PAC_STACKS), the AC6 PAC
index parser, the chunk-coalescing dump fallback, and a user-facing
walkthrough at docs/ac6_asset_extraction_walkthrough.txt.
salh