Track Claude models from the installed CLI per host (STA-3330) (#12369)

* feat(native-chat): track Claude models from the installed CLI per host (STA-3330)

The Claude seed no longer pins version labels to aliases that resolve
differently across CLI versions, and the catalog now defines listModels
backed by a one-shot list_models control request over --print stream-json.
Hosts whose CLI predates the request answer with a control error and keep
the seed. Discovery also feeds Source Control AI via the commit-message
spec, and the /model echo detector matches resolved model names.

* fix(native-chat): preserve discovered Claude capabilities

* fix(native-chat): tolerate malformed Claude model entries

* fix(native-chat): discover models in folder workspaces

* fix(native-chat): trust discovered Claude capabilities

* fix(native-chat): remove Claude model fallbacks

* fix(native-chat): keep the Claude model picker rendered

The Claude picker rendered nothing until the per-host `list_models` probe
returned, so it popped in ~1s after mount and never appeared at all when
the probe failed — an old CLI without `list_models`, no `claude` on PATH,
or an older remote runtime whose response omits `catalogOrigin`.

Restore the version-neutral family seed as the starting list; discovery
still replaces it wholesale on success, so a host with a real catalog
never shows an obsolete hardcoded row.

Separately, the tracked model could fall outside the active list: the
terminal header scrape yields family ids (`opus`) while a current CLI
lists `opus[1m]` and no plain `opus`. That blanked the picker trigger and
dropped the model's effort and fast-mode controls. Reconcile the tracked
id into the active list once, so the snapshot, the appliers, and typed
command recording all see a labelled, operable row for it.

src/shared/commit-message-agent-spec.ts

@@ -1,6 +1,11 @@
 import type { TuiAgent } from './types'
 import { isTuiAgentEnabled } from './tui-agent-selection'
 import { assertJsonTextStructureWithinLimits } from './json-text-structure-limit'
+import {
+  CLAUDE_MODEL_LIST_ARGS,
+  CLAUDE_MODEL_LIST_STDIN,
+  parseClaudeModelList
+} from './claude-model-list-probe'
 
 /* eslint-disable max-lines -- Why: this is the single registry for non-interactive commit-message agents, their model discovery parsers, and UI capabilities. */
 
@@ -16,10 +21,14 @@ export type CommitMessageModel = {
   id: string
   /** Visible label in the model dropdown. */
   label: string
+  /** Discovery-provided detail, e.g. what a CLI alias resolves to on this host. */
+  description?: string
   /** Omit when the model does not expose an effort selector — the UI then hides the dropdown. */
   thinkingLevels?: ThinkingLevel[]
   /** Required when thinkingLevels is present. */
   defaultThinkingLevel?: string
+  /** Whether the model exposes Claude's mid-session Fast mode toggle. */
+  supportsFastMode?: boolean
 }
 
 export type CommitMessageAgentSpec = {
@@ -37,6 +46,8 @@ export type CommitMessageAgentSpec = {
   modelDiscovery?: {
     binary: string
     args: string[]
+    /** Written to the CLI's stdin, for CLIs whose listing is request-driven. */
+    stdinPayload?: string
     parse: (stdout: string) => CommitMessageModel[]
   }
   models: CommitMessageModel[]
@@ -46,8 +57,10 @@ export type CommitMessageAgentSpec = {
 export type CommitMessageModelCapability = {
   id: string
   label: string
+  description?: string
   thinkingLevels?: ThinkingLevel[]
   defaultThinkingLevel?: string
+  supportsFastMode?: boolean
 }
 
 export type CommitMessageAgentCapability = {
@@ -139,6 +152,30 @@ function withOpenAiThinking(
     : {}
 }
 
+export function parseClaudeModels(stdout: string): CommitMessageModel[] {
+  return uniqueModels(
+    parseClaudeModelList(stdout).map((model) => {
+      const thinkingLevels = CLAUDE_THINKING_LEVELS.filter((level) =>
+        model.effortLevels.includes(level.id)
+      )
+      return {
+        id: model.id,
+        label: model.label,
+        ...(model.description ? { description: model.description } : {}),
+        ...(thinkingLevels.length > 0
+          ? {
+              thinkingLevels,
+              defaultThinkingLevel: thinkingLevels.some((level) => level.id === 'low')
+                ? 'low'
+                : thinkingLevels[0].id
+            }
+          : {}),
+        ...(model.supportsFastMode ? { supportsFastMode: true } : {})
+      }
+    })
+  )
+}
+
 export function parseCodexModels(stdout: string): CommitMessageModel[] {
   try {
     assertJsonTextStructureWithinLimits(stdout, COMMIT_MESSAGE_MODEL_JSON_STRUCTURE_LIMITS)
@@ -311,7 +348,16 @@ export const COMMIT_MESSAGE_AGENT_SPECS: Partial<Record<TuiAgent, CommitMessageA
       'plan',
       ...(thinkingLevel ? ['--effort', thinkingLevel] : [])
     ],
-    modelSource: 'static',
+    modelSource: 'dynamic',
+    // Why: the Claude CLI has no listing subcommand; one list_models control
+    // request over --print stream-json returns the /model picker catalog.
+    // Older CLIs answer with a control error and exit 0, keeping the fallback.
+    modelDiscovery: {
+      binary: 'claude',
+      args: [...CLAUDE_MODEL_LIST_ARGS],
+      stdinPayload: CLAUDE_MODEL_LIST_STDIN,
+      parse: parseClaudeModels
+    },
     models: [
       {
         // Why: Claude Code aliases track the account/provider's supported
@@ -744,8 +790,10 @@ function toCommitMessageAgentCapability(
     models: spec.models.map((model) => ({
       id: model.id,
       label: model.label,
+      ...(model.description ? { description: model.description } : {}),
       ...(model.thinkingLevels ? { thinkingLevels: [...model.thinkingLevels] } : {}),
-      ...(model.defaultThinkingLevel ? { defaultThinkingLevel: model.defaultThinkingLevel } : {})
+      ...(model.defaultThinkingLevel ? { defaultThinkingLevel: model.defaultThinkingLevel } : {}),
+      ...(model.supportsFastMode ? { supportsFastMode: true } : {})
     }))
   }
 }