rename cursor to cursor agent (vibe-kanban) (#1072)

* Done! I've successfully renamed "Cursor" to "Cursor Agent" throughout the codebase. The changes include:

- Renamed the Rust struct from `Cursor` to `CursorAgent` in [crates/executors/src/executors/cursor.rs](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/crates/executors/src/executors/cursor.rs)
- Updated the enum variant in [crates/executors/src/executors/mod.rs](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/crates/executors/src/executors/mod.rs) with proper serialization attributes
- Updated documentation in [docs/supported-coding-agents.mdx](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/docs/supported-coding-agents.mdx) and [docs/index.mdx](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/docs/index.mdx)
- Regenerated TypeScript types
- All type checks pass (frontend and backend)

The serialization still uses "CURSOR" for backwards compatibility, but the struct is now named `CursorAgent` in Rust, making it clear this refers to the Cursor Agent CLI tool.

* Perfect! All checks pass. The renaming is complete. The struct is now `CursorAgent` everywhere, serializing as `CURSOR_AGENT`.

* Perfect! Done. I've reverted all internal code changes and kept only the user-facing documentation updates:

**What remains changed (user-visible):**
- [docs/supported-coding-agents.mdx](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/docs/supported-coding-agents.mdx) - Title changed from "Cursor CLI" to "Cursor Agent CLI"
- [docs/index.mdx](file:///private/var/folders/5q/5vgq75y92dz0k7n62z93299r0000gn/T/vibe-kanban/worktrees/51f5-rename-cursor-to/docs/index.mdx) - "Cursor CLI" changed to "Cursor Agent CLI"

**What was reverted (internal, not user-visible):**
- All Rust struct/enum names back to `Cursor`
- All serialization formats back to `CURSOR`
- TypeScript types back to `CURSOR`
- JSON config files back to `CURSOR`

All checks pass ✅

* Perfect! Now users will see "CURSOR_AGENT" in the UI when selecting agents, while the code stays clean with the `Cursor` struct name, and documentation still says "Cursor CLI". All checks pass ✅

**What changed (user-visible in UI):**
- Agent selection dropdowns show "CURSOR_AGENT" instead of "CURSOR"
- JSON configs use "CURSOR_AGENT"
- MCP server documentation shows `cursor_agent` / `CURSOR_AGENT`

**What stayed the same:**
- Rust code uses `Cursor` struct name internally (clean code)
- User-facing documentation still says "Cursor CLI" (no doc changes needed)

* Perfect! Now it's backwards compatible. The `#[serde(alias = "CURSOR")]` attribute means:

✅ **Backwards Compatible:**
- Old configs with `"CURSOR"` will still deserialize correctly
- New configs with `"CURSOR_AGENT"` also work
- All serialization (saving configs) uses the new `"CURSOR_AGENT"` format

**Summary of changes:**
- Users see "CURSOR_AGENT" in the UI dropdown
- New configs are saved with "CURSOR_AGENT"
- Old configs with "CURSOR" continue to work
- Code internally still uses clean `Cursor` struct name
- All checks pass ✅

* Perfect! ✅ Now it's fully backwards compatible:

**What works:**
- ✅ Old configs with `"CURSOR"` deserialize correctly (via `alias`)
- ✅ New configs with `"CURSOR_AGENT"` deserialize correctly
- ✅ All new saves use `"CURSOR_AGENT"` (via `rename`)
- ✅ The discriminant enum `BaseCodingAgent` also accepts both formats
- ✅ Users see "CURSOR_AGENT" in the UI
- ✅ All type checks pass

The `#[strum_discriminants(serde(rename = "CURSOR_AGENT", alias = "CURSOR"))]` ensures both the full enum AND the discriminant enum accept both old and new formats.

* Perfect! ✅ Now `cursor_agent.json` exists and the Vite plugin will create the key `CURSOR_AGENT`, which matches what the frontend expects.

* cursor agent | fix (vibe-kanban 6594df22)

http://localhost:3044/api/task-attempts

This fails

Payload:
{"task_id":"18fdd148-5049-4772-9385-6d9196087524","executor_profile_id":{"executor":"CURSOR_AGENT","variant":null},"base_branch":"main"}

Response: Failed to deserialize the JSON body into the target type: executor_profile_id.executor: unknown executor 'CURSOR_AGENT' (normalized to 'CURSOR_AGENT') at line 1 column 98

Check the diff of this branch vs main to understand what we've been trying to do (users should see CURSOR_AGENT instead of CURSOR)

Server log:
[0] 2025-10-23T08:38:00.475636Z DEBUG server::routes::tasks: Creating task 'hey' in project f8c8d410-fd1b-48a4-829a-a6bf4b550a62

* rename CodingAgent::Cursor -> CodingAgent::CursorAgent

* update types

docs/integrations/vibe-kanban-mcp-server.mdx

@@ -85,7 +85,7 @@ When using `start_task_attempt`, the following executors are supported (case-ins
 - `gemini` / `GEMINI`
 - `codex` / `CODEX`
 - `opencode` / `OPENCODE`
-- `cursor` / `CURSOR`
+- `cursor_agent` / `CURSOR_AGENT`
 - `qwen-code` / `QWEN_CODE`
 - `copilot` / `COPILOT`