Add -X delete operation, demo tape tests, and consolidate demos

- Add -X <id|name> to stop, disable, and remove a job's unit files;
  mutually exclusive with all other management options; 13 new tests
- Add demo/test-tapes.sh to verify all VHS tape commands run cleanly;
  wired into pre-commit hook alongside test.sh (combined badge count)
- Rename demo job names to *_home variants to avoid clashing with real
  user jobs; add per-tape preflight cleanup via -X
- Consolidate four demo GIFs into quickstart + all-features + editmode
  screenshot; remove notifications/services tapes

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

demo/all-features.tape

@@ -0,0 +1,193 @@
+# systab — All Features
+# A complete walkthrough: timers, services, status, logs,
+# disable/enable, list mode, notifications, and edit mode.
+
+Output demo/all-features.gif
+Set Shell bash
+Set Width 1200
+Set Height 700
+Set FontSize 16
+
+Set TypingSpeed 50ms
+
+Sleep 1s
+
+# Clean up any pre-existing jobs with names used in this demo
+Hide
+Type "for n in healthcheck_home monitor_home backup_home health2_home; do systab -X \"$n\" 2>/dev/null || true; done"
+Enter
+Sleep 1s
+Show
+
+# ── Job Creation ──────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Recurring timer with a name'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -t 'every 5 minutes' -n healthcheck_home -c 'echo health check OK'"
+Sleep 500ms
+Enter
+Sleep 2s
+
+Hide
+Type "./demo/note.sh 'One-time reminder in 30 minutes'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -t 'in 30 minutes' -c 'echo reminder: meeting soon'"
+Sleep 500ms
+Enter
+Sleep 2s
+
+Hide
+Type "./demo/note.sh 'Persistent service — starts on login, auto-restarts on failure'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -s -n monitor_home -c 'sleep 3600'"
+Sleep 500ms
+Enter
+Sleep 2s
+
+# ── Status ────────────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Status of all jobs and services'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -S"
+Sleep 500ms
+Enter
+Sleep 3s
+
+# ── Logs ──────────────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Viewing logs for a specific job'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -L healthcheck_home"
+Sleep 500ms
+Enter
+Sleep 2s
+
+# ── Disable / Enable ──────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Disabling a job by name'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -D healthcheck_home"
+Sleep 500ms
+Enter
+Sleep 1s
+
+Type "systab -S healthcheck_home"
+Sleep 500ms
+Enter
+Sleep 2s
+
+Hide
+Type "./demo/note.sh 'Re-enabling the job'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -E healthcheck_home"
+Sleep 500ms
+Enter
+Sleep 2s
+
+# ── Notifications ─────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Add desktop notification with -i (fires on job completion)'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -t 'daily' -n backup_home -c '/home/user/backup.sh' -i"
+Sleep 500ms
+Enter
+Sleep 2s
+
+# ── List mode ─────────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'List all jobs in crontab format with -l'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -l"
+Sleep 500ms
+Enter
+Sleep 2s
+
+# ── Edit mode ─────────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Edit mode — manage jobs in your $EDITOR'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "EDITOR=nano systab -e"
+Sleep 500ms
+Enter
+Sleep 3s
+
+# Navigate to end of file in nano and add a new job with flags
+Ctrl+V
+Sleep 500ms
+Down 5
+Sleep 500ms
+Type "new:n=health2_home,i,e=admin@example.com | hourly | curl -s https://example.com/health"
+Sleep 1s
+Enter
+Sleep 500ms
+
+Ctrl+O
+Sleep 500ms
+Enter
+Sleep 500ms
+Ctrl+X
+Sleep 3s
+
+# Show updated status
+Hide
+Type "./demo/note.sh 'Status after edit — new job added with flags'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -S"
+Sleep 500ms
+Enter
+Sleep 3s
+
+# ── Clean ─────────────────────────────────────────────────────
+
+Hide
+Type "./demo/note.sh 'Clean up completed one-time timers'"
+Enter
+Sleep 500ms
+Show
+Sleep 1s
+Type "systab -C"
+Sleep 500ms
+Enter
+Sleep 2s
+
+Sleep 2s