docs(mac): document privacy-off logging

docs/mac/logging.md

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+# Logging private data on macOS
+
+Unified logging redacts most payloads unless a subsystem opts into `privacy -off`. Per Peter's write-up on macOS [logging privacy shenanigans](https://steipete.me/posts/2025/logging-privacy-shenanigans) (2025) this is controlled by a plist in `/Library/Preferences/Logging/Subsystems/` keyed by the subsystem name. Only new log entries pick up the flag, so enable it before reproducing an issue.
+
+## Enable for Clawdis (`com.steipete.clawdis`)
+- Write the plist to a temp file first, then install it atomically as root:
+
+```bash
+cat <<'EOF' >/tmp/com.steipete.clawdis.plist
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>DEFAULT-OPTIONS</key>
+    <dict>
+        <key>Enable-Private-Data</key>
+        <true/>
+    </dict>
+</dict>
+</plist>
+EOF
+sudo install -m 644 -o root -g wheel /tmp/com.steipete.clawdis.plist /Library/Preferences/Logging/Subsystems/com.steipete.clawdis.plist
+```
+
+- No reboot is required; logd notices the file quickly, but only new log lines will include private payloads.
+- View the richer output with the existing helper, e.g. `./scripts/clawlog.sh --category WebChat --last 5m`.
+
+## Disable after debugging
+- Remove the override: `sudo rm /Library/Preferences/Logging/Subsystems/com.steipete.clawdis.plist`.
+- Optionally run `sudo log config --reload` to force logd to drop the override immediately.
+- Remember this surface can include phone numbers and message bodies; keep the plist in place only while you actively need the extra detail.