fix(core): validate persona builder options

[barryollama]

Follow-up to #29 addressing the valid CodeRabbit union-construction finding before release.

• construct CLI and persona agent definitions in separate branches
• reject both/neither selectors for untyped runtime callers
• reject persona-incompatible role/model/preset/interactive:false fields
• keep model constraints CLI-only
• add runtime regression coverage

Verification: core build, core typecheck, and 83 affected builder/persona/runner tests pass.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1ac4ee4 and 69a8489.

📒 Files selected for processing (2)

• packages/core/src/__tests__/builder-agent-round-trip.test.ts
• packages/core/src/builder.ts

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[cubic-dev-ai]

All reported issues were addressed across 2 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[barryollama]

Addressed Cubic's duplication finding in 69a8489: the model-free shared constraints are now built once, and only the CLI branch adds model. Core build, typecheck, and all six builder tests pass.