fix: require ESM-safe Contracts structure runtime

[artiphishle]

Problem

The structural descriptor generator imports @ankhorage/contracts/structure at runtime, but Devtools still declares @ankhorage/contracts: ^22.1.1. Contracts 22.1.1 contains the pre-fix Node ESM structure subpath; the ESM-safe public structure boundary was released in 22.1.2.

This currently breaks ankhorage-structure check inside Contracts itself with ERR_MODULE_NOT_FOUND while loading the transitive Devtools-owned Contracts 22.1.1 copy.

Scope

• raise Devtools runtime minimum to @ankhorage/contracts@^22.1.2
• refresh only the owning Bun lock resolution
• add a patch changeset
• do not bundle unrelated Renovate/toolchain upgrades from fix(deps): update devtools-owned toolchain #241

Acceptance

• frozen Devtools install resolves Contracts >=22.1.2
• @ankhorage/contracts/structure is Node ESM-loadable through Devtools runtime usage
• build, Doctor, lint, format, Knip, tests, typecheck and changeset checks are green
• release unblocks feat: publish generated screen metadata structure contracts#251 structure drift validation

Skills

• .agents/skills/ankhorage-coding-rules/SKILL.md
• .agents/skills/ankhorage-project-structure/SKILL.md
• .agents/skills/hexagonal-architecture/SKILL.md

Unblocks: ankhorage/contracts#251
Parent consumer: ankhorage/studio#583