The Anonymize preference masks the home folder and addresses in the log and diagnostics

Off by default. Each masked value keeps a tidbit (j*********u, DA:xx:xx:xx:7C:7C,
192.xxx.x.180, m******e.local), so two radios stay two radios. The log masks each
line as it is written; diagnostics take --anonymize/--no-anonymize, and the page
toggles with `a` (Shift+F3 on the PicoCalc). Refs #31.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

docs/guide/features.md

@@ -67,7 +67,7 @@ only describe it. The written pages are at the end.
 | Feature | What it does | Scripted |
 | --- | --- | --- |
 | **⚙ Preferences** | How MeshTerm behaves, in eight groups: Device, Sending, TX optimize, Watchtower, Map, History, Display, and Diagnostics. The page stages your changes, and you save them with one action at the bottom. MeshTerm writes only the values that you changed to `preferences.toml`. [Configuring MeshTerm](configuration.md) has the detail. | `meshterm preferences show / set / reset` |
-| **🩺 Diagnostics** | One block of information that each bug report starts with. It shows which build you have and how you installed it, the operating system, the terminal and its size, and the radio and its link. It also shows the verdicts from boot time that no other screen shows (icons, powerline, platform flavour, and the reasons), and how much history MeshTerm stored. It has nothing private: no keys, passwords, positions, or contact names. It describes the mesh only as counts for each table and the span of time that the tables cover. Press `s` to save the block beside the log, to attach to a report. | `meshterm diagnostics [--out PATH]` |
+| **🩺 Diagnostics** | One block of information that each bug report starts with. It shows which build you have and how you installed it, the operating system, the terminal and its size, and the radio and its link. It also shows the verdicts from boot time that no other screen shows (icons, powerline, platform flavour, and the reasons), and how much history MeshTerm stored. It has nothing private: no keys, passwords, positions, or contact names. It describes the mesh only as counts for each table and the span of time that the tables cover. Press `a` to anonymize it: your account name in the home folder and the addresses of your radio and hosts are masked, and each keeps a tidbit (`j*********u`, `DA:xx:xx:xx:7C:7C`). Press `s` to save the block beside the log, to attach to a report. The **Anonymize** preference opens the page anonymized, and masks the log too. | `meshterm diagnostics [--out PATH] [--anonymize]` |
 | **📖 About MeshTerm** | What MeshTerm is, where it came from, and the terms of its licence. It includes the map credit, the font credit, and the licence URL. | `meshterm about` |
 | **👤 About the author** | The person behind MeshTerm, on the mesh and away from it. | `meshterm about-author` |
 | **🔗 Join Discord** | The community server. The page has one invite link and a QR code of the link, which a phone can read. | `meshterm discord` |