fix(opencode): teach Kit's test what an ID is

[Hona]

Summary

• wrap the new llm.test.ts IDs with ProviderID.make, ModelID.make, SessionID.make, and MessageID.make
• fix the typecheck regression introduced by PR fix(opencode): preserve prompt tool enables with empty agent permissions #17064 after branded IDs landed
• gently remind Kit's latest PR that raw strings are not, in fact, character development for strong IDs

Testing

• bun run typecheck in packages/opencode
• bun test test/session/llm.test.ts --test-name-pattern \"keeps tools enabled by prompt permissions\"
• git push -u origin fix/llm-test-strong-ids (pre-push hook runs repo typecheck)

[Copilot]

Pull request overview

This PR fixes a typecheck regression in packages/opencode tests after branded ID types were introduced, by ensuring test fixtures use the appropriate strong ID wrappers instead of raw strings.

Changes:

• Wrap providerID / model.id passed to Provider.getModel with ProviderID.make and ModelID.make.
• Wrap literal session/message identifiers with SessionID.make and MessageID.make.
• Update the message model.providerID field to use the branded ProviderID.

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