docs: add pipe-to-loki documentation to CLAUDE.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -39,6 +39,30 @@ Do not automatically deploy changes. Deployments are usually done by updating th
 
 Do not run SSH commands directly. If a command needs to be run on a remote host, provide the command to the user and ask them to run it manually.
 
+### Sharing Command Output via Loki
+
+All hosts have the `pipe-to-loki` script for sending command output or terminal sessions to Loki, allowing users to share output with Claude without copy-pasting.
+
+**Pipe mode** - send command output:
+```bash
+command | pipe-to-loki                  # Auto-generated ID
+command | pipe-to-loki --id my-test     # Custom ID
+```
+
+**Session mode** - record interactive terminal session:
+```bash
+pipe-to-loki --record                   # Start recording, exit to send
+pipe-to-loki --record --id my-session   # With custom ID
+```
+
+The script prints the session ID which the user can share. Query results with:
+```logql
+{job="pipe-to-loki"}                           # All entries
+{job="pipe-to-loki", id="my-test"}             # Specific ID
+{job="pipe-to-loki", host="testvm01"}          # From specific host
+{job="pipe-to-loki", type="session"}           # Only sessions
+```
+
 ### Testing Feature Branches on Hosts
 
 All hosts have the `nixos-rebuild-test` helper script for testing feature branches before merging: