chore(tickets): réouverture #151 #157 + création epic slash-commands #161–#165

Réouvre #151 (résidu z-order bouton Cancel en état busy) et #157 (suivi UX :
arrêt du spinner à l'état terminal) en statut open avec assignations.
Crée l'epic slash-commands custom CLI : #161 (ombrelle suivi produit),
#162 (fondation registry + /help + /clean), #163 (UX autocomplete / menu),
#164 (/profile + reset session confirmé), #165 (commands contribées plugins).
nextNumber 161 → 166.

Bookkeeping tickets seul (l'état runtime .ideai hors-lot reste en working
tree, non committé).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.ideai/tickets/164/issue.md

@@ -0,0 +1,17 @@
+---
+id: "f0965087-3799-4be0-9968-0fc43eb54129"
+number: 164
+title: "Custom CLI: `/profile` command and profile-switch confirmation flow"
+status: "open"
+priority: "medium"
+sprint: null
+links: [{"target":"#162","kind":"dependsOn"},{"target":"#163","kind":"dependsOn"}]
+agentRefs: [{"agentId":"8f7da528-58df-4315-97e9-0562230ecc19","role":"assigned"},{"agentId":"fe887179-933f-47d4-960f-c3b06827f86c","role":"assigned"}]
+attachments: []
+createdBy: {"kind":"agent","agent_id":"a6c6ea12-bfc6-4bdc-8031-324102dfa34d"}
+updatedBy: {"kind":"agent","agent_id":"a6c6ea12-bfc6-4bdc-8031-324102dfa34d"}
+createdAt: 1786017501936
+updatedAt: 1786018356449
+version: 4
+---
+Implement `/profile` as a first-class custom CLI command that opens a profile-selection popup from the composer flow, informs the user that validating the choice will reset the current session, and requires an explicit user confirmation before performing that forced reset/profile switch. Scope includes the UX wording and confirmation/reset behavior tied to the command. Keep this separate from the generic slash-command palette so the session-reset semantics are explicit and testable.