release: v0.4.1

[stav121]

• Added TaskScheduler::add_task_get_id, which returns the id assigned to a task so callers can address an unnamed task through a SchedulerHandle; add_task now delegates to it
• Added schedule-helper builders that generate the cron expression for common cadences: TaskBuilder::every_seconds/every_minutes/every_hours/hourly_at/daily_at (out-of-range values are rejected by build(), like an invalid cron string)
• Step-state now streams live during a run: SchedulerHandle::step_states(id) reflects each step transition as it happens, so a completed early step is visible while a later step is still pending (previously only the final snapshot was published)
• Added examples/schedule_helpers_and_streaming.rs demonstrating every_seconds, add_task_get_id and live step streaming; updated README (schedule helpers + live streaming note) and lib.rs Highlights
• Added unit and doctests (88 unit + 45 doctests by default; 90 unit + 45 doctests with --features serde); clippy, fmt and cargo doc clean
• Bumped version to 0.4.1

[codecov]

Codecov Report

❌ Patch coverage is 83.63636% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.46%. Comparing base (595d606) to head (d45dc33).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/task.rs	71.42%	6 Missing ⚠️
src/scheduler.rs	87.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   75.72%   76.46%   +0.74%     
==========================================
  Files           7        7              
  Lines         659      684      +25     
==========================================
+ Hits          499      523      +24     
- Misses        160      161       +1     

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