RT-184 (rt half): gate option descriptions and per-question context

[m4ttheweric]

• rt-client: gate options carry an optional description through normalization; GateQuestion carries an optional per-question context.
• gate:open/gate:ask accept option descriptions and per-question context. The per-question context shares gate:ask's existing 8192-byte context budget with the gate-level context (dropped first if the shared budget overflows). Option descriptions are NOT in that budget: each is separately capped at 1024 bytes per field, with no cap on option or question count.
• rt gate ask/list pin option descriptions and per-question context as verbatim passthrough.
• mcp gate_ask documents option description and per-question context in the input schema.
• e2e: gate ask round-trips option descriptions and question context into list --json.
• Fix (post-review): gate:ask's human-owned MISSING_CONTEXT guard exempted whenever contextOmitted was true, but contextOmitted also covers "only question contexts overflowed the shared budget" (this PR's addition). A human-owned, non-exempt-kind gate with no gate context and oversized question contexts opened with no material anywhere instead of being refused. Fixed to exempt the guard only when the gate context itself was dropped. Caught by an adversarial review with a live probe against the PR head (contextOmitted: true, context: null, ok: true where it should have refused); RED/GREEN test added to gate-ask-handler.test.ts.
• rt half of RT-184; the board/console half shipped separately in board-36.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6348cb7 and aca07f7.

📒 Files selected for processing (12)

• commands/__tests__/gate-ask-cli.test.ts
• commands/__tests__/gate.test.ts
• commands/gate.ts
• e2e/tests/gate-ask-cli.test.ts
• lib/daemon/__tests__/gate-ask-handler.test.ts
• lib/daemon/__tests__/gates-handlers.test.ts
• lib/daemon/handlers/gate.ts
• lib/mcp/__tests__/tools.test.ts
• lib/mcp/tools.ts
• packages/rt-client/src/commands.ts
• packages/rt-client/src/gate-options.ts
• packages/rt-client/test/gate-options.test.ts

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