HOLD: Allow workshop log owners to edit their logs (waiting for workshop_log refactor)

[maebeale]

What is the goal of this PR and why is this important?

• Workshop log creators (owners) could not see the Edit button or access the edit form on the index, org show, or show views
• The edit? policy action was missing from WorkshopLogPolicy, so it fell through to ApplicationPolicy#manage? which is admin-only
• The update? action already allowed owners, creating an inconsistency

How did you approach the change?

• Added edit? method to WorkshopLogPolicy with the same admin? || owner? rule as update?
• No view changes needed — all three views (index, show, org show) already gate the Edit button on allowed_to?(:edit?, log)
• Added WorkshopLogPolicy spec covering edit? and update? for admin, owner, other user, and anonymous contexts

UI Testing Checklist

• Log in as a non-admin user who has created a workshop log
• Verify Edit button appears on workshop logs index
• Verify Edit button appears on workshop log show page
• Verify Edit button appears on organization show page (workshop logs section)
• Verify clicking Edit opens the edit form and saves successfully
• Verify non-owner, non-admin users do NOT see the Edit button

Anything else to add?

• The views already had allowed_to?(:edit?, ...) guards — this was purely a policy gap

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