Add built-in report_screenshot tome for screenshot collection

[Copilot]

This PR adds a new default Tavern tome that executes report.screenshot, enabling operators to trigger screenshot collection without creating a custom tome. The tome is embedded with the existing built-in tome set and imported through the standard startup path.

• New built-in tome: report_screenshot

  • Added tavern/tomes/report_screenshot/main.eldritch
  • Implements screenshot reporting via a single Eldritch call

• Tome metadata

  • Added tavern/tomes/report_screenshot/metadata.yml
  • Defines display name, description, author, support model, and tactic classification (COLLECTION)

• Behavior

  • No loader changes required; the tome is discovered by the existing embedded tome traversal under tavern/tomes/*

report.screenshot()

[hulto]

@copilot Not all displays just primary IIRC. Double check the implementation and libraries and report back.

[Copilot]

Checked eldritch-libreport implementation: report.screenshot() calls xcap::Monitor::all() and iterates each returned monitor, capturing one image per monitor. I updated the tome metadata text to avoid asserting display scope in case platform/library behavior differs in practice. Addressed in 7721b7f.

[Copilot]

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