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/163/carnet.md

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.ideai/tickets/163/issue.md

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+---
+id: "a3fb98de-29fd-4af7-9eff-cdf952f619d0"
+number: 163
+title: "Custom CLI: slash-command autocomplete and contextual menu"
+status: "open"
+priority: "high"
+sprint: null
+links: [{"target":"#162","kind":"dependsOn"}]
+agentRefs: [{"agentId":"8f7da528-58df-4315-97e9-0562230ecc19","role":"assigned"}]
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+createdAt: 1786017501921
+updatedAt: 1786017513680
+version: 2
+---
+Frontend ticket for the custom CLI slash-command UX. When the user types `/` at the start of the composer, show a contextual menu with a small set of matching command suggestions and short descriptions; refine suggestions as the user types (`/c` => commands starting with `c`). Support keyboard navigation and selection. This ticket is only about the custom CLI UX and consumption of the unified command contract; it must not hardcode a closed list of commands in the UI.