Document ytstudio skill reporting workflows

[jdwit]

Summary

• document videos list --sort views|likes with lifetime stats caveat
• add channel-wide comments list examples, spam status, and sort options
• document analytics video/playlist title resolution with --resolve
• note flat videos show JSON fields

Closes #46

Tests

• uv run pytest
• uv run ruff check src tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.28%. Comparing base (b2488fb) to head (6c7aaf1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #48   +/-   ##
=======================================
  Coverage   84.28%   84.28%           
=======================================
  Files          15       15           
  Lines        2500     2500           
  Branches      367      367           
=======================================
  Hits         2107     2107           
  Misses        262      262           
  Partials      131      131           

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[jdwit]

Subagent review (codex review --base main):

The patch only updates skills/ytstudio/SKILL.md, and the newly documented commands/flags appear to match the current CLI behavior in videos, analytics, and comments. I did not find any introduced inaccuracies that would cause users of the skill to invoke unsupported behavior.