feat(models): offer Fable 5.1 in the model picker and task routing

Claude Code 2.1.258's baked-in model catalog carries `claude-fable-5-1`
("Fable 5.1", June 2026 cutoff), but App Settings only offered Fable 5, so
pinning it meant hand-editing a case's .claude/settings.local.json.

Fable 5.1 is added exactly the way Fable 5 already is: a base option carrying
`data-ctx="1"` plus its `[1m]` companion row. The card grid and the context
switch are built from those options, so this needs no settings-ui.js logic
change at all - the card appears with the "1M capable" badge, the switch stays
live for it, and base + switch compose back into `claude-fable-5-1[1m]`.
Both strings are accepted by the CLI's catalog (verified: neither warns
`unrecognized_model`, unlike a made-up id).

The four per-agent-type routing selects and Default-for-tasks get the plain
`claude-fable-5-1` value, matching how Fable 5 appears there.

Deliberately NOT claimed: that Fable 5.1's 1M window is what sets it apart.
The catalog marks BOTH fable entries `native_1m` with a 1e6 window, so a
picker that gave 5.1 an always-on window and left 5 switchable would be
drawing a distinction the models do not have.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BHZgohZC5TbetqgETDnAve

CHANGELOG.md

@@ -1,20 +1,5 @@
 # aicodeman
 
-## 1.24.5
-
-### Patch Changes
-
-- Fable 5.1 is selectable in App Settings.
-
-  `claude-fable-5-1` is in Claude Code's model catalog (display name "Fable 5.1", June 2026 knowledge cutoff), but the model picker only went up to Fable 5, so pinning it meant hand-editing a case's `.claude/settings.local.json`. It now appears as a card under **App Settings -> Models -> New Claude sessions**, and as an option in **Task routing** (Default for tasks, plus the Explore / Implement / Test / Review overrides).
-
-  It is offered exactly the way Fable 5 already is: the "1M capable" badge, the 1M context window switch stays live for it, and base + switch compose into `claude-fable-5-1[1m]`. Both strings are accepted by the CLI.
-
-  Deliberately not claimed: that a 1M window is what sets Fable 5.1 apart. The CLI's model catalog marks both fable entries as natively 1M with the same window, so an always-on window for 5.1 next to a switchable one for 5 would encode a difference the models do not have.
-
-  ### Thanks
-  - @shenlvkang-collab for #370, which surfaced that Fable 5.1 was missing from the picker.
-
 ## 1.24.4
 
 ### Patch Changes

CLAUDE.md

@@ -75,7 +75,7 @@ When user says "COM":
 
 CI runs `npm run check:lockfile` on every push/PR, so lockfile drift fails the build even if the `version-packages` script is bypassed.
 
-**Version**: 1.24.5 (must match `package.json`)
+**Version**: 1.24.4 (must match `package.json`)
 
 ## Project Overview
 

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "aicodeman",
-  "version": "1.24.5",
+  "version": "1.24.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "aicodeman",
-      "version": "1.24.5",
+      "version": "1.24.4",
       "hasInstallScript": true,
       "license": "MIT",
       "workspaces": [

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aicodeman",
-  "version": "1.24.5",
+  "version": "1.24.4",
   "description": "Mission control for AI coding agents - run 20 autonomous agents with real-time monitoring and session persistence",
   "type": "module",
   "main": "dist/index.js",