[v0.2] Rebaseline AGENTS.md for WrightKit repository ownership

[Teakowa]

Release coordination: #135
Architecture dependency: #136
Terminology cleanup: #140
Protocol contract: language-provider-protocol#1

Goal

Update the root AGENTS.md as a concise repo-local operating guide for Wright inside the multi-repository WrightKit ecosystem.

Scope

• Reframe Wright around tooling/orchestration ownership rather than durable ownership of OPY/DEL compiler internals or canonical Workshop semantics.
• Route work to the semantic/product owner before editing:
  • canonical Workshop semantics/catalog/WIR -> workshop-rs;
  • source-language semantics/compiler internals -> the owning provider repo;
  • provider protocol contract -> language-provider-protocol;
  • tooling/orchestration/integration/generic edit safety -> Wright.
• Update the architecture-boundary guidance after [v0.2] Rebaseline language ownership and licensing boundaries #136 is accepted.
• Distinguish current migration state from accepted target architecture.
• Preserve valid operational guidance on issue scope, role authority, provenance, regression evidence, focused diffs, worktrees, and safe delivery.
• Verify any remaining commands/crate paths against the repository and remove stale routing guidance.
• Point to authoritative roadmap/ADR/protocol docs rather than duplicating them.

Non-goals

• Defining the architecture inside AGENTS.md.
• Moving compiler/core code.
• Creating organization-level agent instructions.
• Editing provider-repository agent guides from this issue.

Acceptance criteria

• Root AGENTS.md describes Wright as the WrightKit tooling/orchestration repository.
• Repository selection clearly distinguishes Wright, workshop-rs, LPP, and provider-owned work.
• Current implementation and target ownership are not conflated during migration.
• The document stays concise, repo-local, and backed by accepted architecture/protocol sources.
• No new internal phase-number roadmap terminology is introduced.