v2.2-paseo-providers: Paseo provider stack + v2.2.1 pane-scoped chat fixes

Ship Paseo-equivalent provider snapshot, AgentComposerBar, ACP dispatch
rewrite with streaming/persist, permission prompts, and agent commands.
Follow-up: pane-scoped chat resolution, CoderMessageList tool timeline,
WS user-delta replace, and inference orphan tool_call stripping.
Archive openspec v2-2; update CHANGELOG and CURRENT.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/superpowers/plans/2026-05-25-provider-picker-backend.md

@@ -1,12 +1,14 @@
 # BooCoder Provider Picker — Backend (Steps 1–3)
 
+> **Superseded:** Shipped as `v2.1.0-provider-picker` (2026-05-25). Agent discovery uses direct `exec()` on the host, not SSH. See `CHANGELOG.md` and `apps/coder/src/services/agent-probe.ts` for current implementation.
+
 > **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
 
 **Goal:** Expose a `GET /api/providers` endpoint on BooCoder (port 9502) that returns all available providers with their model lists, so the frontend can build a two-level provider → model picker.
 
 **Architecture:** A static provider registry maps agent names to their metadata (transport, model source). The existing `agent-probe.ts` is extended to discover models for each agent and persist them in a new `models` JSONB column on `available_agents`. A new `/api/providers` route merges the registry with DB state and llama-swap models to produce the response.
 
-**Tech Stack:** Fastify, postgres (porsager), Zod, SSH exec to host for agent discovery.
+**Tech Stack:** Fastify, postgres (porsager), Zod, direct host exec for agent discovery (historical plan referenced SSH — superseded at v2.1.0).
 
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