v2.1.0-provider-picker: BooCoder systemd migration + provider picker

- BooCoder moves from Docker to host systemd service (boocoder.service)
- Agent dispatch (ACP + PTY) switches from SSH to direct spawn/exec
- SSH helpers marked @deprecated (kept for one release cycle)
- Provider registry (5 providers: boocode, opencode, goose, claude, qwen)
- Agent probe with direct which/exec + model discovery (qwen settings, static claude models)
- GET /api/providers route with installed status, models, transport fallback
- ProviderPicker frontend component in CoderPane header
- External provider messages route through tasks row instead of inference enqueue
- Smart scroll: MessageList only auto-scrolls when near bottom (150px threshold)
- DB: available_agents gets models, label, transport columns
- Bug fix: loadContext SELECT includes allowed_read_paths
- Bug fix: cap hit sentinel inserted before buildMessagesPayload
- docker-compose.yml: boocoder service commented out, BOOCODER_URL env var added
- CLAUDE.md: updated docs for systemd, provider registry, JSONB gotcha, loadContext

apps/server/src/services/inference/sentinel-summaries.ts

@@ -36,6 +36,8 @@ export async function runCapHitSummary(
 ): Promise<void> {
   const { sessionId, chatId, assistantMessageId, signal } = args;
 
+  await insertCapHitSentinel(ctx, sessionId, chatId, agent, budget);
+
   const messages = await buildMessagesPayload(session, project, history, agent, ctx.log);
   messages.push({ role: 'system', content: CAP_HIT_SUMMARY_NOTE(budget) });
 
@@ -195,8 +197,6 @@ export async function runCapHitSummary(
     updated_at: sessRow!.updated_at,
   });
 
-  await insertCapHitSentinel(ctx, sessionId, chatId, agent, budget);
-
   // Status frame fires last so the dot color reflects the terminal state.
   // Success → idle, abort → idle (user-driven stop), error → error+reason.
   if (summaryOk) {