docs(skills): make Alexandria feedback optional - #281

Why

The Alexandria skills currently direct an agent to send feedback after every task, even when the user only requested data. Feedback should remain available without becoming a required extra action.

Summary

• Make Alexandria quality feedback optional in the Alexandria, search, and main Firecrawl skills.
• Retain the feedback format, coverage-gap guidance, and opt-out behavior for agents that choose to report an outcome.

Test Plan

• Reviewed every Alexandria feedback instruction across the packaged skills for conflicting mandatory language.
• Ran git diff --check.

Summary by cubic

Makes Alexandria quality feedback optional in the firecrawl-alexandria, firecrawl-search, and firecrawl skills so agents are no longer directed to send feedback after every task.

• firecrawl-search and firecrawl now defer to firecrawl-alexandria for optional feedback about a provider result or coverage gap, sent at most once per website.
• The feedback command syntax, issue codes, and background --silent & pattern are unchanged.

^{Written for commit ee54a35. Summary will update on new commits.}