https://gitlab.synchro.net/main/sbbs/-/commit/4af502dcf316b308bd5de71a
Modified Files:
src/doors/syncretro/M2_INPUT.md M3_MULTICORE.md M4_AUDIO.md
Log Message:
syncretro: record what the milestone docs' deferred items became

M2_INPUT.md, M3_MULTICORE.md and M4_AUDIO.md are the design record the
door's code cites by section for its defaults, its measurements and its rejected alternatives, so their "Deferred, with reasons" tails get read
as current. Several of those items have since shipped while still
reading as open work:

- the volume hotkey (M4) -- '+'/'-' walking a 0..100 percent
- the CP437 text tier (M2) -- charset taken from the client, F4 cycles
- core options and save states (M3) -- the option store, and suspend as
an automatic per-user snapshot
- the NES install (M3), which had no cartridges and no xtrn.ini entry
- the Intellivision keypad's end-to-end semantics (M2), blocked at the
time on a BIOS the install now carries

Each item keeps its original reasoning and gains what actually happened, including where that differs from the plan: save-state hotkeys and a save
UI are still open, and a descriptor-derived per-game legend was answered
from the other end by games.ini, for the console that sends no
descriptors at all. Two section cross-references corrected in passing.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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