feat: add include_tags and include_description to ContentOptions

[gregoryfoster]

Summary

include_tags and include_description were designed in #88 but deferred because Watch does not yet have tags or description fields. Once those fields exist on Watch, add them to ContentOptions.

Blocked by

• Watch model gaining tags (list of strings) and description (text) fields

Scope (once unblocked)

• Add include_tags: bool = False and include_description: bool = False to ContentOptions in src/api/schemas/content_config.py
• Enrich WatchEvent.metadata in _watch_base_metadata() (src/workers/tasks.py):
  • tags: watch.tags if set
  • description: watch.description if set
• Add _build_tags_section() and _build_description_section() to src/core/notifications/content.py
• Add checkboxes to notification_content_options.html
• Tests for new sections in tests/core/notifications/test_content.py

Notes

Module docstring in src/api/schemas/content_config.py already notes this deferral.

[gregoryfoster]

Implemented in commit 83eeb8f.

• Added tags: ARRAY(String) and description: Text columns to the Watch model with migration 917d378da82f
• Also added last_changed_at: DateTime column + migration fa835a9e496d (unblocking feat: content option — include last changed date (include_last_changed_at) #94)
• include_tags: bool = False and include_description: bool = False added to ContentOptions
• _watch_base_metadata() enriched: injects tags (list) and description (str) when set on the Watch
• _build_tags_section() renders "Tags: foo, bar"; _build_description_section() renders "Description: …"
• Both silently omit when key absent or empty
• Dashboard checkboxes added; full test coverage in TestBuildTagsSection / TestBuildDescriptionSection