docs(readme): document the uninstall script

Adds an Uninstall section describing usage, the confirmation guard,
and its removal/backup semantics, and mentions it in the feature list.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -108,8 +108,9 @@ Install and update also rebuild internally; the explicit build above lets you ch
   files are retained with a warning.
 - Dry-run support (no destination writes, backups, or plugin changes) and timestamped backup directories.
 - Finish notifications, Claude session-state hooks, optional safety utilities, and compact status displays.
-- Separate install and update scripts: install refuses to run against an already-installed destination, update refuses
-  to run against one that is not installed yet.
+- Separate install, update, and uninstall scripts: install refuses to run against an already-installed destination,
+  update refuses to run against one that is not installed yet, and uninstall refuses to run against one that was
+  never installed.
 - User-level plugin installation for Ponytail, i-have-adhd, Superpowers, Context7, Caveman, QMD, Humanizer, Impeccable, and
   Anthropic Frontend Design, with an interactive extension toggle during both install and update. Only extensions
   integrations installed and recorded by this setup can be removed through deselection.
@@ -241,6 +242,42 @@ installer, re-syncs every managed file, and lets you revise the CLI update, Flas
 Selected extensions are installed or updated. Deselection removes only extensions recorded as installed by this
 setup; pre-existing or manually installed extensions are retained. Quickupdate reuses the saved choices.
 
+## Uninstall
+
+Remove everything this setup previously installed for the selected client(s): managed files tracked in each
+destination's manifest, extensions and skills recorded in the extension ledger, an enabled semantic retrieval setup,
+and the saved Quickupdate selection (once no destination remains installed for any client).
+
+PowerShell:
+```powershell
+.\scripts\uninstall.ps1
+```
+
+Bash:
+```bash
+./scripts/uninstall.sh
+```
+
+Omitting `-Client`/`--client` opens the same selection prompt as install and update. Uninstall refuses to continue
+if none of the selected destinations are installed (`Not installed, nothing to uninstall.`), unless previewing with
+`-DryRun`/`--dry-run`, which always works and never changes anything.
+
+Because this removes configuration rather than adding it, a real run asks for confirmation (type `yes`) before
+touching anything, unless `-Force`/`--force` is passed; running without a terminal attached and without `-Force`/`--force`
+fails instead of hanging. Removal reuses the same manifest-sync logic as install and update: every managed file is
+backed up under `backups/<timestamp>/` before removal, and a file changed locally since the last install/update is
+backed up but left in place with a warning instead of being deleted. Files this setup never installed are never
+touched. A destination directory is only deleted once it is fully empty; backups already on disk are always kept.
+Extensions and skills recorded in the ledger are removed the same way `update` removes a deselected extension:
+pre-existing or manually installed ones outside the ledger are left alone, and a skill file modified since it was
+installed is kept with a warning. An enabled semantic retrieval setup is disabled and its setup-owned runtime and
+index removed for the selected client(s). The saved Quickupdate selection (`~/.my-ai-configuration/selection.json`)
+is only removed once uninstalling leaves no client installed at all, so uninstalling just one client out of a
+`Both` installation keeps the saved choices for the client that remains.
+
+Uninstall does not remove the CLI tools themselves (`codex`, `claude`), any plugin marketplace registrations they
+keep outside this setup's ledger, or files this setup never installed.
+
 ## Doctor
 
 Check client availability, generated packages, source directories, hooks, and installed managed files: