chore: changesets for #453, #444, #459 and #458

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

.changeset/0ccf5098.md

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+"aicodeman": patch
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+
+refactor(run-menu): one table-driven launcher for every external CLI
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+The eight near-identical per-CLI launch functions in the Run menu collapsed into one launcher driven by a table that a CI test keeps in step with the CLI registry, and a second no-id-branching guard now covers the frontend the way the backend guard covers the server. No behaviour change: the refactor was verified byte-identical across 288 launch permutations against the previous code.

.changeset/d129d23b.md

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+"aicodeman": minor
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+feat(custom-model): the model picker puts the ready model first
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+When a custom endpoint has more than one model, the Run menu's picker now promotes one row to the top instead of showing raw discovery order: the model llama-swap reports loaded and ready right now (tagged "Currently loaded", the one a launch attaches to with zero wait), else the model you last launched on that harness and endpoint (tagged "Last used", remembered per device). The endpoint's default keeps its own pill, nothing is ever auto-chosen, and a plain OpenAI-compatible server or an endpoint that does not answer within a second simply keeps the old order. The probe is bounded on the client too, so a GPU box that is off no longer holds the picker closed for five seconds.

.changeset/e37fe1bf.md

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+"aicodeman": minor
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+feat(split-pane): view two live sessions side by side
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+A new Split button in the header (opt-in in App Settings, off by default, desktop only at 1180px and wider) opens a picker and shows a second live session beside the active one: its own terminal, its own WebSocket, and a divider you can drag. When either session ends the view collapses back to one pane, with Pane B promoted to the primary when it is Pane A that ended. Nothing is persisted on purpose in this first cut, so a page reload always returns to a single pane. Pane B is deliberately plainer than the primary pane (no local-echo overlay, CJK input, touch handling or keyboard accessory bar); the design and the v2 boundaries are in discussion #452.

.changeset/fcddb592.md

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+"aicodeman": minor
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+
+feat(mobile): a Compose key for writing prompts on a phone
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+The agent keyboard bars on phones replace their Paste key with Compose: a real multiline editor with autocorrect and spellcheck, per-session drafts kept in memory only, image attach that never writes into the terminal early, and a Send that delivers the text as one paste followed by Enter, so a long prompt no longer has to be typed blind into the terminal composer. Anything you had already typed into the terminal is picked up into the editor. Shell sessions keep the direct Paste key. This is the manual first slice from #359; the auto-open setting and terminal tap routing are a separate follow-up.