v0.11.0 — GPT-5.6/Grok 4.5 モデル整合（model 引数・effort 実態合わせ）

GPT-5.6 / Grok 4.5 世代へのモデル整合リリース。

Added

• model argument on all three agent launchers. codex_agent forwards it as -m; grok_agent / composer_agent override --model. Empty/whitespace values are rejected before a session exists.
• Managed CODEX_HOME pin override. With agent_done: true, explicitly passed model / reasoning_effort also rewrite the matching top-level pins in the managed config.toml copy, so terminal pins (e.g. an ultra effort pin = proactive multi-agent delegation ON) no longer silently leak into interactive children. Unspecified keys and [table] sections are preserved verbatim.
• Effective-config reporting. Codex launch responses always state the effective model/effort and where each came from (argument / terminal-config inheritance / CLI default), with an explicit warning when the effective effort is ultra.

Changed

• grok_agent default model: grok-build → grok-4.5. The old slug no longer exists in the live model catalog.
• reasoning_effort on grok_agent / composer_agent is now a pre-launch error instead of a silent no-op: the grok CLI's --effort is headless-only (grok -p) and the interactive TUI warns and ignores it; Composer doesn't support reasoning effort at all. The former low/medium/high/xhigh/max enum is gone. codex_agent keeps an unconstrained string (CLI-version dependent, up to ultra).

Regression suite: 183 tests green (ubuntu / macos CI). Live-launch verified against Codex CLI 0.144.1 (GPT-5.6 Sol/Terra/Luna) and grok CLI 0.2.87 (grok-4.5 / grok-composer-2.5-fast).