feat(engine): transport response_presentation across session paths (#1331)

[jacktrnr]

Implements #1331 (part of #1330 — the response-presentation / "concise mode" epic). TDD, tracer-bullet by tracer-bullet.

Progress

• Shared enum — ResponsePresentation (concise | standard | detailed) in @opencode-ai/schema, with a rejecting contract test.
• v1 admission — optional field on PromptInput, ShellInput, CommandInput; HTTP payloads derive from these, so admission propagates.
• v2 wire contract + core session.prompt threading
• Persist on the admitted session_input (queue/replay parity, AC2)
• v2 server handler + protocol payload forward
• Regenerate JS SDK + client generated artifacts (AC3)
• Full compatibility matrix (test(app): verify response-presentation compatibility matrix #1334 is the dedicated verifier)

Protected regressions (green)

• Agent-inheritance (BUG: amicode_ask answer flips develop/research sessions to plan mode (agent omitted in promptAsync) #1206) — test/session/prompt.test.ts
• Bedrock final-step guard — test/provider/transform.test.ts

Closes #1331

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[jacktrnr]

Superseded by the concise-mode skill (PR #1633). We chose a toggleable output-shaping skill over the response-presentation engine epic — it delivers 'toggle concise on/off' at a fraction of the cost with no fork expansion. The v1 enum work here isn't needed for that route. Closing unmerged; branch left for reference.