wip: context-meter + model-label UI and provider/inference tweaks

Checkpoint of in-flight work so the orchestrator branch can rebase onto a
clean main: ContextBar → ContextMeter, model-label helper, model/agent picker
+ provider-snapshot/registry changes, inference payload + message-columns.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/coder/src/services/provider-registry.ts

@@ -47,17 +47,18 @@ export const PROVIDERS: ProviderDef[] = [
     label: 'Claude Code',
     transport: 'pty',
     modelSource: 'static',
-    // Passed verbatim to `claude --model <id>` (PTY dispatch). The CLI accepts a
-    // latest-alias ('opus'/'sonnet'/'haiku') or a pinned full name
-    // ('claude-opus-4-8'). Aliases never go stale; pinned IDs let you select an
-    // exact version. Extend/replace per-install via data/coder-providers.json
+    // Passed verbatim to `claude --model <id>` (PTY dispatch). Pinned full
+    // names; the `[1m]` suffix selects the 1M-context variant of that model
+    // (e.g. `claude --model claude-opus-4-8[1m]`). First entry is the default
+    // (the snapshot carries no isDefault, so the frontend falls back to
+    // models[0]). Extend/replace per-install via data/coder-providers.json
     // (models / additionalModels) without a code change.
     staticModels: [
-      { id: 'opus', label: 'Opus (latest)' },
+      { id: 'claude-opus-4-8[1m]', label: 'Opus 4.8 1M' },
       { id: 'claude-opus-4-8', label: 'Opus 4.8' },
-      { id: 'sonnet', label: 'Sonnet (latest)' },
+      { id: 'claude-sonnet-4-6[1m]', label: 'Sonnet 4.6 1M' },
       { id: 'claude-sonnet-4-6', label: 'Sonnet 4.6' },
-      { id: 'haiku', label: 'Haiku (latest)' },
+      { id: 'claude-haiku-4-5-20251001[1m]', label: 'Haiku 4.5 1M' },
       { id: 'claude-haiku-4-5-20251001', label: 'Haiku 4.5' },
     ],
   },