feat(question): free-form questions render as text cards (amicode#245)

[jeonghun-jj-lee]

Refs harmoniqs/amicode#245. Design of record: docs/adr/0002-free-form-questions-render-as-text-cards.md (already on local/amicode).

What

• Schema (v1 + v2 question shapes — agent-facing Prompt and server Info both carry it via the shared base): one new optional kind — "choice" (default) | "text". An absent kind decodes as a choice question (back-compat); an unknown kind fails decoding loudly (Literal enum — never silently degrades). Legacy SDK + packages/client regenerated; kind?: "choice" | "text" is the only generated diff.
• Renderers — a text-kind question renders a text card: header + bare text input + submit; no option rows, no "Type your own answer" pseudo-option; submit requires non-empty trimmed text; answers ride the existing typed-custom-answer path (no new plumbing); dismissal/rejection semantics unchanged.
  • App dock (session-question-dock.tsx) — additionally now honors the custom flag for choice cards (it previously appended the pseudo-option unconditionally; follows the TUI's flag check).
  • TUI (routes/session/question.tsx) and CLI (cmd/run/question.shared.ts + footer).
• Prose guard (extracted verbatim to session/prose-guard.ts): behavior unchanged — still forces prose questions in active interviews into cards, at most one nudge per assistant message, never after a question-tool call. The nudge text is now bilingual: choice questions re-ask with options (recommended first); free-form questions re-ask with kind: "text". No classification heuristics — the model picks the shape from the question it is re-asking.
• Question-tool description teaches the text kind for free-form questions.
• AMICODE-PATCHES.md patch 26 records the fork-surface changes with an upstream-sync watch note (the dock is a high-conflict file).

Test evidence

• packages/schema: 16/16 question tests (both shapes; absent→choice; explicit choice/text; unknown kind throws); typecheck clean. (Full suite has 2 pre-existing event-manifest failures that reproduce on a clean tree.)
• packages/opencode: CLI text-card 10/10, prose-guard 10/10, tool 4/4; wire-shape snapshot diff is exactly the kind field. Full suite 3519 pass / 24 documented pre-existing fails (pasqal ×8, widgets ×15, flaky PTY ×1 — see AMICODE-PATCHES.md).
• packages/tui: new real render tests 5/5 (testRender + stub server — typed answer submits through the custom path; empty Enter never submits; custom:false hides the row). Full suite 196/196.
• packages/app: dock shape helpers 6/6; unit suite 783/783; tsgo -b clean.
• packages/core 1081/1081 · packages/protocol 2/2 · packages/client 16/16 + generated-types check in sync · packages/ui 441/441.

Ships

This is the engine half of amicode#245. The extension's contract-text changes ride the next engine pin cut from this merge — the companion extension PR stays draft until it picks up that pin bump + re-vendor, per the issue's Key Decisions.

---

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