feat(doc-mode): unified surface — ephemeral tasks, tmp/, /exec redirect, palette, SWR (#117)

Phases 1-3 of the unified-surface plan, bundled per the user's request.
The directive document/folder UI is now the canonical place to interact
with makima; legacy /exec is subsumed by routing redirects, /contracts is
already hidden in nav, and orphan tasks surface under a top-level tmp/
pseudo-folder. Phase 4 (porting contract-only features) was confirmed
out of scope; Phase 5 (deleting the contracts code) is a follow-up.

## Backend

- New migration `20260501000000_archive_existing_contracts.sql` flips
  every legacy contract to `archived` so /contracts is read-only history.
- New endpoint `POST /api/v1/directives/{id}/tasks` creates an ephemeral
  task — `directive_id` set, `directive_step_id` NULL, repo/branch
  inherited from the directive. Reuses `create_task_for_owner`.
- New endpoint `GET /api/v1/directives/{id}/tasks` lists ephemeral tasks
  attached to a directive (drives the per-folder ephemeral group).
- `GET /api/v1/mesh/tasks?orphan=true` returns top-level tasks with no
  `directive_id` AND no `parent_task_id` — backs the sidebar's tmp/.
- New repo helpers `list_ephemeral_directive_tasks_for_owner` and
  `list_orphan_tasks_for_owner`.
- The existing `mesh_merge` endpoints are reused as-is for ephemeral
  task merge (no new merge logic needed).

## Frontend

### Sticky composer + auto-scroll fix (`DocumentTaskStream.tsx`)
- Sticky comment composer pinned to viewport bottom; padding compensates
  so the last entry isn't hidden behind it.
- `autoScroll` now resumes when the user scrolls back within 80px of
  the bottom (previously stuck off forever after a single scroll-up).
- Floating "↓ Jump to latest" chip when the user has scrolled away.
- Action header strip: explicit Stop / Send / Open-in-task-page +
  conditional "Merge to base ↗" button on ephemeral terminal tasks.
- Module-level cache of historical entries by taskId so re-selecting a
  task you've viewed renders instantly while a fresh fetch runs.

### Sidebar (`document-directives.tsx`)
- Top-level `tmp/` folder: orphan tasks, polled every 5s.
- Per-directive `tasks/` subfolder now also surfaces ephemeral tasks
  (lazily fetched on folder open) with a distinct asterisk-on-terminal
  icon (`EphemeralTaskIcon`).
- Inline hover-action chips on each directive folder header: Start /
  Pause / PR / +New task. Right-click menu still works as a power-user
  fallback.
- "Now executing" amber strip in the editor pane: surfaces the live
  orchestrator/completion/running-step task with a one-click jump.
- Inline `+ New task` modal (name + plan); on submit calls
  `createDirectiveTask` and navigates into the freshly-spawned task.
- New `EphemeralAwareTaskStream` wrapper passes `ephemeral` and
  `status` to `DocumentTaskStream` so the merge button only shows when
  the selected task is genuinely an ephemeral spinoff in a terminal
  state. Step-spawned tasks merge via the directive's PR completion.

### SWR cache (`useDirectives.ts`)
- Module-level `listCache` and per-id `detailCache` (mirrors the pattern
  in `useUserSettings.ts`). Mounting the hook renders the cache value
  immediately if present and kicks a background refresh; subscribers see
  the new value when it lands. Cuts perceived navigation latency to
  near-zero on warm cache hits.

### QuickSwitcher (`QuickSwitcher.tsx`, new)
- IntelliJ-style double-Shift command palette mounted at app root.
- Listens at the document level for two `Shift` keydowns within 300ms
  with no other key in between; ignores while focus is in an
  input/textarea so capitalising letters doesn't pop the palette.
- Searches across directives + their tasks (orchestrator/completion/
  steps/ephemerals) + orphan tmp tasks. Fuzzy matches on title.
- Eagerly loads task details for the first 20 directives on open so
  searches don't block on per-directive fetches.

### Routing (`main.tsx` + `exec-redirect.tsx` + `tmp.tsx`)
- New `ExecRedirect` wrapper at `/exec/:id`: when documentMode is on
  AND the task has a `directiveId`, replaces the URL with
  `/directives/<directiveId>?task=<taskId>`. Otherwise renders the
  legacy `MeshPage` as before.
- New `/tmp/:taskId` route renders `DocumentTaskStream` standalone for
  orphan tasks, with the masthead and a `tmp / <slug>` breadcrumb.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/makima/src/server/handlers/mesh.rs b/makima/src/server/handlers/mesh.rs
index 1a5b9c1..ac5652a 100644
--- a/makima/src/server/handlers/mesh.rs
+++ b/makima/src/server/handlers/mesh.rs
@@ -78,10 +78,24 @@ pub fn extract_auth(state: &SharedState, headers: &HeaderMap) -> AuthSource {
 // Task Handlers
 // =============================================================================
 
-/// List all tasks for the current owner.
+/// Query parameters for `list_tasks`. Currently only the `orphan` filter —
+/// when set, returns tasks with NO parent_task_id AND NO directive_id, used
+/// by the document-mode sidebar's `tmp/` folder.
+#[derive(Debug, serde::Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ListTasksQuery {
+    #[serde(default)]
+    pub orphan: bool,
+}
+
+/// List all tasks for the current owner. Pass `?orphan=true` to restrict to
+/// top-level tasks with no directive attachment.
 #[utoipa::path(
     get,
     path = "/api/v1/mesh/tasks",
+    params(
+        ("orphan" = Option<bool>, Query, description = "Filter to tasks with no directive_id and no parent_task_id"),
+    ),
     responses(
         (status = 200, description = "List of tasks", body = TaskListResponse),
         (status = 401, description = "Unauthorized", body = ApiError),
@@ -97,6 +111,7 @@ pub fn extract_auth(state: &SharedState, headers: &HeaderMap) -> AuthSource {
 pub async fn list_tasks(
     State(state): State<SharedState>,
     Authenticated(auth): Authenticated,
+    axum::extract::Query(query): axum::extract::Query<ListTasksQuery>,
 ) -> impl IntoResponse {
     let Some(ref pool) = state.db_pool else {
         return (
@@ -106,7 +121,13 @@ pub async fn list_tasks(
             .into_response();
     };
 
-    match repository::list_tasks_for_owner(pool, auth.owner_id).await {
+    let result = if query.orphan {
+        repository::list_orphan_tasks_for_owner(pool, auth.owner_id).await
+    } else {
+        repository::list_tasks_for_owner(pool, auth.owner_id).await
+    };
+
+    match result {
         Ok(tasks) => {
             let total = tasks.len() as i64;
             Json(TaskListResponse { tasks, total }).into_response()