Nitwit 1.3.3 — Compatibility Restore

- Restored the declared Minecraft dependency range to >=1.21 <=26.3, as in the previous broad-compatibility builds.
- Kept the existing adaptive stability/performance classes and config from 1.3.2.
- Removed the 1.21.1-specific mandatory Elytra mixin and its config from this broad build. Keeping that mixin enabled on all listed versions could fail because it targets version-specific internals.
- No FPS/TPS/ping guarantee is made. A client mod cannot make a remote server tick faster or eliminate network round-trip time.
- The Elytra reference remains a behavior reference; no cross-version Elytra network-latency fix is included in this release.

Validation: archive integrity, JSON syntax, dependency range, and absence of the unsafe global mixin were checked. Live testing inside Minecraft across all versions was not available.
