feat(scores): interview contract — free-form asks use question text kind (#245)

[jeonghun-jj-lee]

Closes #245.

Companion engine PR: harmoniqs/opencode#113 — that PR must merge and release first; this one stays draft until it picks up the resulting pin (see "Why draft" below).

What

• Compiled interview contract (src/scores/compiler.ts): the one-sentence rule — every question is a card via the native question tool; choice questions list options (recommended first); free-form questions take text via kind: "text". "Free-form answers can be plain text" is gone from the contract.
• Score bodies (scores/overture/SCORE.md, scores/pulse-designer/SCORE.md): the same change in both bodies. Choice-question instructions (options, recommended-first, typed-custom-answer row) are untouched.

Test evidence

• pnpm --filter amicode test -- test/scores: 13 files / 138 tests green, including new compiled-prompt assertions on both compileScore(pulse-designer) and compileChainedScore(overture, pulse-designer) — the text-kind instruction is present, the plain-text phrasing is gone, and choice-question contract text is undisturbed. pnpm --filter amicode run typecheck: clean.
• Full fast suite: 852 pass / 3 pre-existing environment-dependent fails (server_auth.test.ts AMICO_PYTHON venv path — reproduce identically on pristine main).

Why draft — rides the engine pin

Per the issue's Key Decisions, this contract text ships with the next engine pin, not ahead of it: the currently pinned engine (v1.18.10-amicode.1) does not know kind: "text", so merging now would instruct a field the vendored engine cannot honor.

Merge sequence:

1. The fork PR merges → the next fork release (vX.Y.Z-amicode.N) is cut.
2. This PR picks up the pin bump: packages/extension/opencode.lock.json + re-vendor.
3. Mark ready → merge → closes BUG: Onboarding profile step is multiple-choice only — no free-text entry for name #245.

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Orchestrated via amicode /develop (issue-DAG walk — single-slice unit, TDD per slice).