feat(local-llm): Phase F — scheduled tasks (F1-F7)
F1: cron-parser integration + cron utility functions (parse, nextRun, toHuman, shouldRunNow)
F2: ScheduledTask + Project + Orchestration CRUD in IndexedDB
F3: Task editor modal (schedule, model, input source, output action, prompt)
F4: Browser-based task runner with setInterval + cron matching
F5: /api/system/exec — safe shell command execution with allowlist
F6: Task run history stored per task (last 20 runs)
F7: 5 built-in task templates (morning brief, git diff, disk usage, code review, deps)
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