first pass of merging in warp (doesn't build)

specs/REMOTE-1595/PRODUCT.md

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+# Handoff-Compose Footer Chip Filtering — Product Spec
+Linear: [REMOTE-1595](https://linear.app/warpdotdev/issue/REMOTE-1595)
+## Summary
+When `&` handoff-compose mode is active, the agent view footer should show only the chips relevant to composing a cloud run — hiding local-context and local-agent-only items that do not apply.
+## Problem
+The default agent footer shows chips for local context (working directory, git branch, diff stats, SSH, etc.) and local-agent controls (autodetection toggle, fast-forward, context window usage, handoff-to-cloud chip). None of these are meaningful when the user is drafting a prompt to hand off to a cloud agent. Showing them adds clutter and implies they affect the cloud run.
+## Behavior
+### Shown items
+While `&` handoff-compose mode is active, the footer shows only:
+1. **Environment selector** — the transient `&` selector, already wired (not a toolbar item).
+2. **ModelSelector** — the user may want to choose which model the cloud agent uses.
+3. **VoiceInput** — alternative input method for dictating the prompt.
+4. **FileAttach** — file/image attachments carry to the cloud run.
+### Hidden items
+All other `AgentToolbarItemKind` variants are hidden while `&` is active:
+- All `ContextChip(...)` variants — local context, not sent to the cloud run.
+- `NLDToggle` — input is locked AI in `&` mode; autodetection is irrelevant.
+- `ContextWindowUsage` — shows local conversation context, not cloud.
+- `FastForwardToggle` — fast-forward state does not carry into cloud runs.
+- `HandoffToCloud` — already in handoff mode; redundant.
+- `ShareSession` — not relevant to composing a handoff.
+### Constraints
+- The user's configured footer layout is not modified. Items are only visually hidden while `&` is active; exiting `&` mode restores the normal footer.
+- Items the user has explicitly hidden in their toolbar config remain hidden regardless.
+- The filtering applies only in the agent view footer, not the CLI agent footer.
+## Figma
+None provided.
+## Validation
+- Enter `&` mode in a local fullscreen agent view. Confirm only ModelSelector, VoiceInput, FileAttach, and the environment selector are visible.
+- Exit `&` mode. Confirm the full configured footer layout is restored.
+- Verify that hidden items are not removed from the user's toolbar config.

specs/REMOTE-1595/TECH.md

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+# Handoff-Compose Footer Chip Filtering — Tech Spec
+Product spec: `specs/REMOTE-1595/PRODUCT.md`
+Linear: [REMOTE-1595](https://linear.app/warpdotdev/issue/REMOTE-1595)
+## Context
+`AgentInputFooter::render_toolbar_item` (`app/src/ai/blocklist/agent_view/agent_input_footer/mod.rs:1945`) is called for each user-configured left/right toolbar item during footer rendering. It already filters by `available_in()` and `available_to_session_viewer()`. The footer already has access to `handoff_compose_state: ModelHandle<HandoffComposeState>` (added in the REMOTE-1558 PR).
+The environment selector for `&` mode is rendered separately at `mod.rs:2108`, outside the toolbar item loop, so it is unaffected by toolbar filtering.
+## Proposed changes
+### 1. Add `AgentToolbarItemKind::is_available_during_handoff_compose`
+Add a method on `AgentToolbarItemKind` in `toolbar_item.rs` that returns whether the item should render during `&` handoff-compose mode:
+```rust path=null start=null
+fn is_available_during_handoff_compose(&self) -> bool {
+    matches!(
+        self,
+        Self::ModelSelector | Self::VoiceInput | Self::FileAttach
+    )
+}
+```
+### 2. Guard in `render_toolbar_item`
+At the top of `render_toolbar_item` (`mod.rs:1945`), after the existing `available_in()` / `available_to_session_viewer()` guard, add:
+```rust path=null start=null
+if self.handoff_compose_state.as_ref(app).is_active()
+    && !item.is_available_during_handoff_compose()
+{
+    return None;
+}
+```
+This is purely a render-time filter; it does not mutate the user's configured layout.
+## Testing
+- Unit test: verify `is_available_during_handoff_compose` returns `true` only for `ModelSelector`, `VoiceInput`, `FileAttach`.
+- Integration/manual: enter `&` mode, confirm only those three items plus the environment selector render. Exit `&`, confirm full footer restores.