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, 65 insertions, 0 deletions

diff --git a/makima/src/db/repository.rs b/makima/src/db/repository.rs
index 27bd47e..b41c74c 100644
--- a/makima/src/db/repository.rs
+++ b/makima/src/db/repository.rs
@@ -1189,6 +1189,71 @@ pub async fn list_tasks_for_owner(
     .await
 }
 
+/// List ephemeral tasks attached to a directive — tasks with `directive_id`
+/// set but no `directive_step_id`. These are the "spinoff" tasks the user
+/// created via the directive folder context menu, distinct from
+/// step-spawned execution tasks. Hidden tasks excluded.
+pub async fn list_ephemeral_directive_tasks_for_owner(
+    pool: &PgPool,
+    owner_id: Uuid,
+    directive_id: Uuid,
+) -> Result<Vec<TaskSummary>, sqlx::Error> {
+    sqlx::query_as::<_, TaskSummary>(
+        r#"
+        SELECT
+            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
+            c.status as contract_status,
+            t.parent_task_id, t.depth, t.name, t.status, t.priority,
+            t.progress_summary,
+            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
+            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
+        FROM tasks t
+        LEFT JOIN contracts c ON t.contract_id = c.id
+        WHERE t.owner_id = $1
+          AND t.directive_id = $2
+          AND t.directive_step_id IS NULL
+          AND t.parent_task_id IS NULL
+          AND COALESCE(t.hidden, false) = false
+        ORDER BY t.created_at DESC
+        "#,
+    )
+    .bind(owner_id)
+    .bind(directive_id)
+    .fetch_all(pool)
+    .await
+}
+
+/// List "orphan" top-level tasks for an owner — tasks that are NOT attached
+/// to a directive and NOT a subtask of another task. These surface in the
+/// document-mode sidebar under a top-level `tmp/` folder. Hidden tasks
+/// excluded.
+pub async fn list_orphan_tasks_for_owner(
+    pool: &PgPool,
+    owner_id: Uuid,
+) -> Result<Vec<TaskSummary>, sqlx::Error> {
+    sqlx::query_as::<_, TaskSummary>(
+        r#"
+        SELECT
+            t.id, t.contract_id, c.name as contract_name, c.phase as contract_phase,
+            c.status as contract_status,
+            t.parent_task_id, t.depth, t.name, t.status, t.priority,
+            t.progress_summary,
+            (SELECT COUNT(*) FROM tasks WHERE parent_task_id = t.id) as subtask_count,
+            t.version, t.is_supervisor,             COALESCE(t.hidden, false) as hidden, t.created_at, t.updated_at
+        FROM tasks t
+        LEFT JOIN contracts c ON t.contract_id = c.id
+        WHERE t.owner_id = $1
+          AND t.parent_task_id IS NULL
+          AND t.directive_id IS NULL
+          AND COALESCE(t.hidden, false) = false
+        ORDER BY t.priority DESC, t.created_at DESC
+        "#,
+    )
+    .bind(owner_id)
+    .fetch_all(pool)
+    .await
+}
+
 /// List subtasks of a parent task, scoped to owner.
 pub async fn list_subtasks_for_owner(
     pool: &PgPool,