refactor(ai): remove obsolete context and model adapters

[izadoesdev]

The private AI package still exposed a request/authentication path with no callers, a single-caller website validation wrapper, and a model router that only returned its input. Remove those adapters and their unused types and exports. Current callers use the existing website lookup and validated model tier directly.

Website-not-found errors, organization isolation, API-key scopes, session permissions, tier validation, and the balanced default retain their behavior. The existing authorization test now explicitly checks a missing site before permission evaluation. No new files or dependencies. Net reduction: 177 lines across 8 files.

Validation: root lint, all 33 type/build tasks, all 27 test tasks, 76 focused AI tests, and 11 actual API route tests pass. Independent diff review found no issues.

Scope: internal AI adapters and their direct callers. No dependencies or file overlap with open PR #751 or #790.

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Summary by cubic

Removes the unused request/authentication path, website validation wrapper, and model router from the private AI package. Callers now use the existing website lookup and validated model tier directly.

Refactors

• Website-not-found errors, organization isolation, API-key scopes, session permissions, tier validation, and the balanced default keep their existing behavior.
• The authorization test now explicitly checks a missing site before permission evaluation.

^{Written for commit 5382e98. Summary will update on new commits.}

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[greptile-apps]

Greptile Summary

This PR removes obsolete internal AI adapters and routes their remaining caller directly through the existing website lookup and validated model tier.

• Removes the identity model router and its private package exports.
• Removes unused request-context, timezone, and website-validation helpers.
• Preserves website-not-found handling, organization isolation, API-key scope checks, session permissions, and the balanced model default.
• Adds focused coverage ensuring a missing website is rejected before permission evaluation.

Confidence Score: 5/5

The PR appears safe to merge; the removed adapters have no remaining callers, and the direct replacements preserve validated model selection and website authorization behavior.

No actionable failures remain: accepted model tiers match every configured model key, the removed symbols are unused within the private package, and the website access path retains not-found, organization, scope, and permission checks.

Important Files Changed

Filename	Overview
apps/api/src/routes/agent.ts	Replaces the identity tier router with a direct, schema-validated model-key assignment while retaining the balanced default.
packages/ai/src/ai/mcp/tool-context.ts	Uses the underlying cached website lookup directly while preserving not-found, tenant, API-key, and session permission checks.
packages/ai/src/lib/website-utils.ts	Removes unused request-context and validation adapters while retaining all website lookup functions used by current consumers.
packages/ai/package.json	Removes the obsolete router subpath from the private package export map with no remaining repository consumers.
packages/ai/src/ai/mcp/tool-context.test.ts	Updates the website lookup mock and adds coverage that missing sites fail before authorization checks.

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