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/test-tapes.sh

@@ -0,0 +1,119 @@
+#!/usr/bin/env bash
+# test-tapes.sh — Verify all systab commands in VHS tape files run correctly.
+# Greps Type "systab ..." and Type "EDITOR=... systab ..." lines from *.tape
+# files and runs them in order per tape, reporting pass/fail.
+#
+# Run from the project root: ./demo/test-tapes.sh
+
+set -uo pipefail
+
+# Make ./systab callable as 'systab', matching how tapes reference it
+PATH="$PWD:$PATH"
+export PATH
+
+TAPE_DIR="demo"
+SYSTEMD_USER_DIR="${HOME}/.config/systemd/user"
+
+passed=0
+failed=0
+total=0
+tape_job_ids=()
+
+if [[ -t 1 ]]; then
+  GREEN=$'\033[32m' RED=$'\033[31m' BOLD=$'\033[1m' RESET=$'\033[0m'
+else
+  GREEN="" RED="" BOLD="" RESET=""
+fi
+
+pass() {
+  echo "${GREEN}[PASS]${RESET} $1"
+  passed=$((passed + 1))
+  total=$((total + 1))
+}
+
+fail() {
+  echo "${RED}[FAIL]${RESET} $1 — $2"
+  failed=$((failed + 1))
+  total=$((total + 1))
+}
+
+# Stop, disable, and remove all unit files created during tape tests
+cleanup_tape_jobs() {
+  [[ ${#tape_job_ids[@]} -eq 0 ]] && return
+  for id in "${tape_job_ids[@]}"; do
+    [[ -z "$id" ]] && continue
+    for ext in service timer; do
+      local f="$SYSTEMD_USER_DIR/systab_${id}.${ext}"
+      [[ -f "$f" ]] || continue
+      systemctl --user stop "systab_${id}.${ext}" 2>/dev/null || true
+      systemctl --user disable "systab_${id}.${ext}" 2>/dev/null || true
+      rm -f "$f"
+    done
+  done
+  systemctl --user daemon-reload 2>/dev/null || true
+  tape_job_ids=()
+}
+
+trap cleanup_tape_jobs EXIT
+
+# Collect any job IDs from command output into tape_job_ids
+collect_ids() {
+  local id
+  while IFS= read -r id; do
+    [[ -n "$id" ]] && tape_job_ids+=("$id")
+  done < <(sed -n 's/^\(Job\|Service\) created: \([0-9a-f]\{6\}\).*$/\2/p' <<< "$1")
+}
+
+# Prepare a tape command for test execution:
+#   - EDITOR=nano → EDITOR=cat  (non-interactive; cat exits 0, no file changes)
+#   - strip trailing " | less"  (we capture stdout directly)
+normalize() {
+  local cmd="$1"
+  cmd="${cmd//EDITOR=nano/EDITOR=cat}"
+  cmd="${cmd% | less}"
+  echo "$cmd"
+}
+
+# Run all systab commands from one tape file in order
+run_tape() {
+  local tape="$1"
+  local tape_name
+  tape_name=$(basename "$tape" .tape)
+
+  echo ""
+  echo "${BOLD}=== $tape_name ===${RESET}"
+
+  cleanup_tape_jobs  # each tape starts with a clean slate
+
+  local raw cmd output exit_code
+  while IFS= read -r raw; do
+    cmd=$(normalize "$raw")
+    exit_code=0
+
+    # Pipe /dev/null for commands that read stdin interactively
+    if [[ "$cmd" == *"systab -C"* ]] || [[ "$cmd" == *"systab -e"* ]]; then
+      output=$(eval "$cmd" < /dev/null 2>&1) || exit_code=$?
+    else
+      output=$(eval "$cmd" 2>&1) || exit_code=$?
+    fi
+
+    collect_ids "$output"
+
+    if [[ $exit_code -eq 0 ]]; then
+      pass "$tape_name: $raw"
+    else
+      fail "$tape_name: $raw" "exit $exit_code: ${output:0:120}"
+    fi
+  done < <(grep -E '^Type "(systab |EDITOR=)' "$tape" | sed 's/^Type "//; s/"$//')
+}
+
+echo "${BOLD}Testing systab commands from VHS tape files...${RESET}"
+
+for tape in "$TAPE_DIR"/*.tape; do
+  run_tape "$tape"
+done
+
+echo ""
+echo "---"
+echo "${BOLD}${total} tape commands: ${GREEN}${passed} passed${RESET}, ${RED}${failed} failed${RESET}"
+[[ $failed -eq 0 ]]