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, 161 insertions, 0 deletions

diff --git a/makima/src/server/handlers/directives.rs b/makima/src/server/handlers/directives.rs
index 7a7aff4..7b13f1c 100644
--- a/makima/src/server/handlers/directives.rs
+++ b/makima/src/server/handlers/directives.rs
@@ -12,6 +12,7 @@ use crate::db::models::{
     CleanupResponse, CreateDirectiveRequest, CreateTaskRequest,
     CreateDirectiveStepRequest, Directive, DirectiveListResponse,
     DirectiveRevision, DirectiveStep, DirectiveWithSteps, PickUpOrdersResponse,
+    Task,
     UpdateDirectiveRequest, UpdateDirectiveStepRequest, UpdateGoalRequest,
     CreateDirectiveOrderGroupRequest, DirectiveOrderGroup,
     DirectiveOrderGroupListResponse, UpdateDirectiveOrderGroupRequest,
@@ -2194,3 +2195,163 @@ pub async fn list_directive_revisions(
         }
     }
 }
+
+// =============================================================================
+// Ephemeral tasks under a directive
+//
+// A directive can spin up ad-hoc one-off tasks that are NOT part of its DAG.
+// They live in the `tasks` table with `directive_id` set and
+// `directive_step_id = NULL` — the existing schema already supports this; we
+// just expose the create path through a directive-scoped endpoint and
+// inherit repo/branch from the parent directive when the caller doesn't
+// override.
+// =============================================================================
+
+/// Request body for creating an ephemeral task under a directive.
+#[derive(Debug, serde::Deserialize, ToSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct CreateDirectiveTaskRequest {
+    /// Human-readable name (used for branch/commit names).
+    pub name: String,
+    /// Plan / instructions for the Claude Code session.
+    pub plan: String,
+    /// Optional override for the directive's repository.
+    pub repository_url: Option<String>,
+    /// Optional override for the directive's base branch.
+    pub base_branch: Option<String>,
+}
+
+/// List the ephemeral tasks (no directive_step_id) attached to a directive.
+#[utoipa::path(
+    get,
+    path = "/api/v1/directives/{id}/tasks",
+    params(("id" = Uuid, Path, description = "Directive ID")),
+    responses(
+        (status = 200, description = "List of ephemeral tasks", body = crate::db::models::TaskListResponse),
+        (status = 503, description = "Database not configured", body = ApiError),
+    ),
+    security(("bearer_auth" = []), ("api_key" = [])),
+    tag = "Directives"
+)]
+pub async fn list_directive_tasks(
+    State(state): State<SharedState>,
+    Authenticated(auth): Authenticated,
+    Path(id): Path<Uuid>,
+) -> impl IntoResponse {
+    let Some(ref pool) = state.db_pool else {
+        return (
+            StatusCode::SERVICE_UNAVAILABLE,
+            Json(ApiError::new("DB_UNAVAILABLE", "Database not configured")),
+        )
+            .into_response();
+    };
+
+    match repository::list_ephemeral_directive_tasks_for_owner(pool, auth.owner_id, id).await {
+        Ok(tasks) => {
+            let total = tasks.len() as i64;
+            Json(crate::db::models::TaskListResponse { tasks, total }).into_response()
+        }
+        Err(e) => {
+            tracing::error!("Failed to list ephemeral tasks: {}", e);
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(ApiError::new("LIST_FAILED", &e.to_string())),
+            )
+                .into_response()
+        }
+    }
+}
+
+/// Create an ephemeral task attached to a directive.
+#[utoipa::path(
+    post,
+    path = "/api/v1/directives/{id}/tasks",
+    params(("id" = Uuid, Path, description = "Directive ID")),
+    request_body = CreateDirectiveTaskRequest,
+    responses(
+        (status = 201, description = "Ephemeral task created", body = Task),
+        (status = 404, description = "Directive not found", body = ApiError),
+        (status = 503, description = "Database not configured", body = ApiError),
+    ),
+    security(("bearer_auth" = []), ("api_key" = [])),
+    tag = "Directives"
+)]
+pub async fn create_directive_task(
+    State(state): State<SharedState>,
+    Authenticated(auth): Authenticated,
+    Path(id): Path<Uuid>,
+    Json(req): Json<CreateDirectiveTaskRequest>,
+) -> impl IntoResponse {
+    let Some(ref pool) = state.db_pool else {
+        return (
+            StatusCode::SERVICE_UNAVAILABLE,
+            Json(ApiError::new("DB_UNAVAILABLE", "Database not configured")),
+        )
+            .into_response();
+    };
+
+    // Look up the parent directive so we can inherit its repository/base branch
+    // when the caller doesn't override them. Also gates the request on
+    // ownership: if the directive isn't visible to this owner, 404.
+    let directive = match repository::get_directive_for_owner(pool, auth.owner_id, id).await {
+        Ok(Some(d)) => d,
+        Ok(None) => {
+            return (
+                StatusCode::NOT_FOUND,
+                Json(ApiError::new("NOT_FOUND", "Directive not found")),
+            )
+                .into_response();
+        }
+        Err(e) => {
+            tracing::error!("Failed to load directive for ephemeral task: {}", e);
+            return (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(ApiError::new("DB_ERROR", &e.to_string())),
+            )
+                .into_response();
+        }
+    };
+
+    let repo_url = req
+        .repository_url
+        .or_else(|| directive.repository_url.clone());
+    let base_branch = req.base_branch.or_else(|| directive.base_branch.clone());
+
+    let create_req = CreateTaskRequest {
+        contract_id: None,
+        name: req.name,
+        description: None,
+        plan: req.plan,
+        parent_task_id: None,
+        is_supervisor: false,
+        priority: 0,
+        repository_url: repo_url,
+        base_branch,
+        target_branch: None,
+        merge_mode: None,
+        target_repo_path: None,
+        completion_action: None,
+        continue_from_task_id: None,
+        copy_files: None,
+        checkpoint_sha: None,
+        branched_from_task_id: None,
+        conversation_history: None,
+        supervisor_worktree_task_id: None,
+        directive_id: Some(directive.id),
+        // No directive_step_id — this is what makes the task "ephemeral":
+        // it lives under the directive folder but isn't part of the DAG.
+        directive_step_id: None,
+    };
+
+    match repository::create_task_for_owner(pool, auth.owner_id, create_req).await {
+        Ok(task) => (StatusCode::CREATED, Json(task)).into_response(),
+        Err(e) => {
+            tracing::error!("Failed to create ephemeral directive task: {}", e);
+            (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                Json(ApiError::new("CREATE_FAILED", &e.to_string())),
+            )
+                .into_response()
+        }
+    }
+}