PHLEGM v4 Build Comments

Archive: PHLEGM-v4-Developer-Distribution-Source-2026-0926-1740-5324.zip

- v4 is the active line; v3 is unsupported legacy.
- Rewrote active PHLEGM documentation around the load-time compiled CFG VM.
- Removed legacy documentation trees from the v4 payload.
- State/session identity advanced to V4/format 4 with exact-format acceptance only.
- Removed cfg/cpu compatibility path resolution; v4 CPU root is cfg/chipset.
- Versioned build/package/installer script identity advanced to v4.
- Retained quick normal self-test and explicit -FullSelfTest exhaustive validation.
- Retained NES NROM cartridge persistence, ROM/CART/CARTRIDGE insertion, and EJECT.
