Add reasoning-effort column to the pin router dialog

[edwin-zvs]

Summary

• Extends the model-router pin dialog (status bar) with a third column for reasoning effort when the selected route/model advertises a real scale (Codex/OpenAI, Claude thinking, Grok, Kimi K3).
• Persists optional pin effort on SessionRoute / session.set_route and injects it on pin-routed requests; native catalog picks still own effort via the request body (spec 0160).
• Updates modeline to show pin effort on the routed side: origin → model (effort).

Interaction

Column	Action
Target	Select / preview (or clear via “No redirect”)
Model	Select; commits immediately if no effort scale
Effort	Commits pin with that effort

Keyboard: Right walks targets → models → efforts; Left walks back; Enter activates the focused step.

Spec

• New: specs/0165-pin-router-selects-reasoning-effort.md
• Cross-links in 0114 / 0160

Test plan

• cargo test -p construct-daemon --lib -- router::
• cargo test -p construct-cli --bin construct -- route_menu
• cargo build in worktree
• Manually: open model router from status bar on a route-capable session → pick codex-oauth / openai profile → confirm effort column → arm → modeline shows → model (effort)
• Confirm targets without a scale (e.g. Gemini) still arm on model click with no third column

Binaries

This PR touches protocol, daemon, client, and cli → relevant binary is construct.

Debug binary (worktree):

/Users/moon/agentd/.claude/worktrees/pin-router-effort-column/target/debug/construct