[v0.2 workshop-rs] Establish the canonical multi-locale Workshop core

[Teakowa]

Parent: #135
Roadmap: #134
Related foundation: #96

Goal

Extract and complete the Workshop implementation as a separately versioned canonical semantic core for the Wright ecosystem and for standalone Workshop tooling.

Scope

• Move canonical Workshop ownership out of the Wright tooling repository boundary into workshop-rs.
• Separate Workshop IR from source-language-specific HIR/models.
• Own the canonical Workshop catalog: actions, values, events, enums, heroes, maps, game modes, settings, localization metadata, signatures, availability/version metadata, and provenance.
• Use catalog-driven/allowlisted semantic recognition: supported definitions are explicit; unknown/unsupported language constructs fail deterministically rather than being guessed.
• Complete raw Workshop parsing/validation/emission for the declared supported surface, including settings.
• Add localized raw Workshop input and output with locale-independent canonical semantic identities.
• Make raw Workshop locale conversion a first-class standalone capability, with the first release gate covering complete en-US <-> zh-CN semantic conversion for the declared catalog surface.
• Preserve user-authored identifiers/strings/comments according to a documented policy; only Blizzard-defined Workshop language/content tokens are localized by default.
• Add catalog/content version identity and a reproducible update/provenance pipeline so new game content can be added as data where semantics permit.
• Provide a library and standalone CLI suitable for use without Wright.

Non-goals

• Guaranteeing every Overwatch client locale in the first extraction release.
• OPY/OSTW source-language semantics.
• Wright-specific lint/agent/tool orchestration.
• Guessing unknown future Workshop syntax as valid semantics.

Acceptance criteria

• workshop-rs has no dependency on Wright tooling crates or OPY/OSTW provider internals.
• Canonical Workshop IDs are locale-independent and are the semantic identity used by parser/emitter/catalog APIs.
• The supported raw Workshop surface round-trips through parse -> canonical semantics -> emit.
• en-US -> zh-CN and zh-CN -> en-US raw Workshop conversion are corpus-tested for the declared surface, including settings and representative actions/values/events/enums/content identifiers.
• Missing target-locale mappings fail explicitly by default rather than silently emitting mixed-locale source; any fallback mode is opt-in and documented.
• Catalog provenance/version identity is machine-readable and reproducible.
• Standalone workshop CLI/library usage is documented and tested.

[Teakowa]

Moved to wrightkit/workshop-rs#2. Wright-side dependency/cutover work is tracked separately in #143.