Add scheduler job name uniqueness and prereqs for SQLite executor

[NodeJSmith]

Summary

Prerequisite changes for the SQLite command executor (#264):

• App.app_key property — exposes the app's configuration key from its manifest, needed for SQLite row identification
• Scheduler job name uniqueness — enforces unique names per scheduler instance via _jobs_by_name dict tracking. Adds if_exists parameter ("error" | "skip") to add_job() and all run_* methods for idempotent registration. ScheduledJob.matches() compares callable, trigger, repeat, args, and kwargs to determine if an existing job is logically identical
• Trigger equality — __eq__/__hash__ on IntervalTrigger (compares interval) and CronTrigger (compares cron expression) for configuration-based comparison, excluding runtime state like start
• ExecutionResult rename — started_at → monotonic_start to clarify it stores a monotonic clock value, not a wall-clock timestamp
• StateProxy disconnect fix — on_disconnect() now calls scheduler.remove_job() instead of job.cancel() to properly free the name slot, and subscribe_to_events() uses if_exists="skip" for idempotent reconnection

Breaking changes

• Scheduler raises ValueError on duplicate job names (previously allowed)
• ExecutionResult.started_at renamed to monotonic_start

Closes #264

[Copilot]

Pull request overview

This PR introduces prerequisite changes needed for the SQLite command executor feature (#264). The changes focus on job name uniqueness validation, idempotent job registration, clearer naming for timing metrics, and improved reconnection handling.

Changes:

• Added App.app_key property for accessing the app's configuration key from its manifest
• Enforced job name uniqueness per scheduler instance with if_exists parameter ("error" | "skip") for idempotent registration
• Renamed ExecutionResult.started_at to monotonic_start to clarify it stores monotonic clock values, not wall-clock timestamps
• Implemented __eq__/__hash__ on trigger classes for configuration-based comparison
• Fixed StateProxy disconnect to use scheduler.remove_job() instead of job.cancel() to properly free the job name slot

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/hassette/app/app.py	Added app_key property that delegates to app_manifest.app_key
src/hassette/utils/execution.py	Renamed started_at to monotonic_start in ExecutionResult
src/hassette/scheduler/scheduler.py	Added _jobs_by_name tracking, if_exists parameter on all run methods, and name uniqueness validation
src/hassette/scheduler/classes.py	Added ScheduledJob.matches() method and __eq__/__hash__ to IntervalTrigger and CronTrigger
src/hassette/core/state_proxy.py	Changed disconnect to use remove_job() instead of cancel() and added if_exists="skip" to polling job
tests/unit/test_scheduler_job_names.py	Comprehensive tests for job name uniqueness and if_exists behavior
tests/unit/test_func_utils.py	Tests for callable_name() and callable_short_name() edge cases
tests/unit/test_app_key.py	Test for App.app_key property
tests/unit/test_execution.py	Updated tests for monotonic_start rename
tests/integration/test_scheduler.py	Added explicit job names to prevent uniqueness conflicts
CHANGELOG.md	Documented all changes including breaking changes

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated no new comments.

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[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.81%. Comparing base (e55adfd) to head (072a896).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/hassette/scheduler/classes.py	50.00%	6 Missing and 1 partial ⚠️
src/hassette/scheduler/scheduler.py	85.71%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
+ Coverage   79.63%   79.81%   +0.17%     
==========================================
  Files         131      131              
  Lines        9297     9325      +28     
  Branches      927      931       +4     
==========================================
+ Hits         7404     7443      +39     
+ Misses       1526     1520       -6     
+ Partials      367      362       -5     

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