recover: restore untracked work from recovery branch (no Gemini changes)

Recovered files with no Claude→Agent contamination:
- docs/adr/002-task-state-machine.md
- internal/api/logs.go/logs_test.go: task-level log streaming endpoint
- internal/api/validate.go/validate_test.go: POST /api/tasks/validate
- internal/api/server_test.go, storage/db_test.go: expanded test coverage
- scripts/reset-failed-tasks, reset-running-tasks
- web/app.js, index.html, style.css: frontend improvements
- web/test/: active-tasks-tab, delete-button, filter-tabs, sort-tasks tests

Manually applied from server.go diff (skipping Claude→Agent rename):
- taskLogStore field + validateCmdPath field
- DELETE /api/tasks/{id} route + handleDeleteTask
- GET /api/tasks/{id}/logs/stream route
- POST /api/tasks/{id}/resume route + handleResumeTimedOutTask
- handleCancelTask: allow cancelling PENDING/QUEUED tasks directly

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/web/test/delete-button.test.mjs b/web/test/delete-button.test.mjs
new file mode 100644
index 0000000..b82b487
--- /dev/null
+++ b/web/test/delete-button.test.mjs
@@ -0,0 +1,60 @@
+// delete-button.test.mjs — visibility logic for the Delete button on task cards
+//
+// Run with: node --test web/test/delete-button.test.mjs
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+
+// ── Logic under test ──────────────────────────────────────────────────────────
+// A delete button should be shown for any task that is not actively executing.
+// RUNNING and QUEUED tasks cannot be deleted via the API (409), so we hide the button.
+
+const NON_DELETABLE_STATES = new Set(['RUNNING', 'QUEUED']);
+
+function showDeleteButton(state) {
+  return !NON_DELETABLE_STATES.has(state);
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+describe('delete button visibility', () => {
+  it('shows for PENDING', () => {
+    assert.equal(showDeleteButton('PENDING'), true);
+  });
+
+  it('shows for COMPLETED', () => {
+    assert.equal(showDeleteButton('COMPLETED'), true);
+  });
+
+  it('shows for FAILED', () => {
+    assert.equal(showDeleteButton('FAILED'), true);
+  });
+
+  it('shows for CANCELLED', () => {
+    assert.equal(showDeleteButton('CANCELLED'), true);
+  });
+
+  it('shows for TIMED_OUT', () => {
+    assert.equal(showDeleteButton('TIMED_OUT'), true);
+  });
+
+  it('shows for BUDGET_EXCEEDED', () => {
+    assert.equal(showDeleteButton('BUDGET_EXCEEDED'), true);
+  });
+
+  it('shows for READY', () => {
+    assert.equal(showDeleteButton('READY'), true);
+  });
+
+  it('shows for BLOCKED', () => {
+    assert.equal(showDeleteButton('BLOCKED'), true);
+  });
+
+  it('hides for RUNNING', () => {
+    assert.equal(showDeleteButton('RUNNING'), false);
+  });
+
+  it('hides for QUEUED', () => {
+    assert.equal(showDeleteButton('QUEUED'), false);
+  });
+});