docs(adr-0004): note server-side arm constraint (staged-skill drift) - #297
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…gative path, mid-session re-bind, turn-boundary auto S2 (spec-20260907-011500 D2, #859): the plan-exit confirm surface, first- class on the app overlay (the fork #297 slice-b intent, ported to the substrate — composed on the EXISTING /amicode/* route family and the app's agent binding, never a new engine contract). - GET/POST /amicode/posture (+ /dismiss): a DUMB READER of the compiled plan's STAMPED posture_recommendation — the service never re-derives, never keyword-guesses; an unstamped plan reads null and the offer stays quiet. plan.auto_switch = confirm | auto rides the ops-dir prefs file (fail-safe to confirm). Dismissal is per-plan_hash (a recompile re-arms). - The indicator view-model (pure, headless-tested): named states absent / quiet / offer; the confirm surface carries the NEGATIVE path one click each — confirm / dismiss / wrong—actually <other mode> / stay in plan; a MIXED-shape recommendation names BOTH modes (the user picks — no silent coin-flip); dismissed → ambient again. - Switch mechanics (the Tab-switch contract, made product): local.agent.set IS the mid-session re-bind; in-session it also lands the posture change on the session record (session.update metadata — the ADR-0011 vNext additive surface, fire-and-forget). plan.auto_switch=auto defers the click to the TURN BOUNDARY (never mid-generation), announces, drops when a newer plan supersedes; ONLY the agent binding changes — the session's draft and pending questions ride along untouched. - Bidirectional (D2): the collapsed indicator in develop/research carries the walk-back-to-plan affordance. - Ambient-when-ignored (the observability clause): quiet until there is a recommendation; the offer banner is the one thing that asserts itself; renders NOTHING when the route does not exist (older extension). - Mounted twice: home flyout (acts on the default/draft posture) and the session header's titlebar-right portal (the mid-session re-bind surface). - i18n ×18 locales (15 keys, parity-checked); manifest hash registration for all 23 touched overlay files (#848 gate — drift gate PASS). Refs #859
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Appends to ADR-0004's Accepted costs section: the arm target (
/session/:id/command) resolves against the server's command set, not the extension's staged skill paths. Documents the pre-flight guard and the constraint that non-extension-hosted servers must re-stage skills on extension updates.Closes the docs layer of #296.