Rebrand v0.1.6

Rebranding

• Global Project Rename: Formally transitioned from "Medi" to Tolvex.
• CLI Tooling: Renamed the package manager CLI to tvx (formerly medipack/tlvxpack).
• Compiler: Renamed the compiler binary to tlvxc.
• Registry: Updated the package registry to formulary.tolvex.dev.
• Manifests: Changed package manifest filename to formula.toml and lockfile to formula.lock.
• Package Terminology: Standardized on "formulas" for Tolvex packages.
• File Extensions: Transitioned from .medi to .tlvx for source files.
• Crate Reorganization:
  • Compiler internal crates renamed to tlvxc_*.
  • Standard library crates renamed to tolvex_*.
• Namespaces: Updated standard library namespaces from medi::* to tolvex::*.