Release X3 Zero mod 0.0.1 with grounded X/Zero exchange

[mstan]

Release the optional X3 Zero mod as version 0.0.1, independently of the X2/X3 boss-weapon expansion. Adds original Zero body/saber/teleport/HUD artwork, X1 weapon adaptation, grounded Select exchange with frozen stage simulation, separate current HP with active-only healing, title/pause presentation, and the original X 1-up icon. Corrects the first charge tier to the native small green projectile.

Players select their original X3 USA ROM in Mods; the native extractor validates it and generates private assets automatically. The release ships no source ROMs or extracted caches. The X3 path uses a shared resource key for the later weapon mod. X2/X3 weapons and co-op are excluded from this PR.

Validation:

• Five focused CTests and the full ROM-backed Zero runtime suite passed, including native first-tier projectile checks with and without arms, swap/HP behavior, native X1 specials, saves, rollback, rewind and menu fades.
• Native/reference extraction parity, copier headers, wrong-ROM rejection and preservation of a valid cache passed.
• Fresh ZIP install generated the Zero cache from the selected ROM and cold-booted for 180 frames, exit 0. No save state loaded.
• ZIP content and Windows runtime DLL closure audited; no local mod state, ROMs, caches, saves or weapon packages included.

Known limits and source findings are documented in docs/zero-0.0.1.md and docs/zero-port.md. Original X3 projectile/audio fidelity and broader campaign validation remain follow-up work.

Depends on the published framework shared-ROM support in RetroPortingToolKit/snesrecomp#131. This preserves main's existing framework/UI features and pins the tested dependency commit.