AGENTS.md: add mandatory Deletion & Trash Policy (mv to ~/.AGENTTRASH, never rm)

Explicit rule: stage deletions in a dated ~/.AGENTTRASH/YYYYMMDD-topic
directory, list sizes, and wait for user approval before purging. rm,
rm -rf, and git clean -f forbidden without explicit permission. Applies
to every host.

AGENTS.md

@@ -62,6 +62,30 @@ All script edits must flow through git. Do not edit files on the remote machine
 5. **Pull on the target** — `git pull` on the remote machine before restarting
 6. **Restart the service** — use the updated script on the target
 
+## Deletion & Trash Policy (MANDATORY)
+
+Never run `rm` to delete files. The command deletes permanently. Move every
+item you would delete into `~/.AGENTTRASH/` instead. The trash keeps the
+deletion recoverable and reviewable.
+
+Procedure:
+
+1. Create a dated staging directory: `mkdir -p ~/.AGENTTRASH/YYYYMMDD-topic`
+2. Move each item: `mv <path> ~/.AGENTTRASH/YYYYMMDD-topic/`
+3. List the staged items and their sizes for the user.
+4. Wait for explicit user permission before you empty the trash.
+
+Rules:
+
+- `rm`, `rm -rf`, and `git clean -f` are forbidden without explicit user
+  permission.
+- `git * --no-verify` is forbidden.
+- A moved item stays in the trash until the user approves its purge.
+- The trash is a temporary hold, not a long-term archive.
+
+Use `mv`, never `rm`. This applies to every host, including Dankserver and
+Dankclaw.
+
 ## Deployment & Update Process
 
 Use `scripts/deploy.sh` to deploy committed changes to a target. It pushes `main`, pulls on the target, restarts the service, and checks the health endpoint.