feat(assets): review and delete orphan files from posts/assets/

[wab]

Parent

#32

What to build

Two steps:

1. HITL review of posts/scripts/audit-orphans.json produced by the audit script. Each entry inspected to confirm it is genuinely unused (no active reference missed by the script). False positives removed from the list before deletion.
2. Delete script posts/scripts/delete-orphan-assets.js:
   • Reads audit-orphans.json
   • Dry-run mode (default) prints what would be deleted
   • --confirm flag executes the deletions via fs.unlink
   • Prints summary: deleted count, errors

After execution, commit the deletions with a conventional chore(assets): remove unused client variants and legacy team photos.

Also: add .DS_Store (and any other OS noise found) to posts/.gitignore if not already.

Acceptance criteria

• HITL review of audit-orphans.json complete (false positives removed)
• posts/scripts/delete-orphan-assets.js reads the JSON, dry-run by default, --confirm executes
• Prints summary on completion
• All confirmed orphans deleted from posts/assets/
• .DS_Store (and similar) added to posts/.gitignore
• Cleanup committed atomically with conventional message
• Re-running node scripts/audit-assets.js reports 0 orphans

Blocked by

• feat(assets): audit posts/assets/ filesystem against markdown + website slug patterns #33