Forbid em dashes everywhere; add AGENTS.md with repo rules

skills/versiond-admin/SKILL.md

@@ -34,7 +34,7 @@ server is the trust model); there are no keys to manage.
   `#*#`, `*~`, `4913`), SQLite journals as standalone files.
 - SQLite rule: backup-API snapshot + `integrity_check`; locked/corrupt →
   loud skip (`database-locked`, `database-corrupt`), never a stored version.
-- Databases >~100MB or hot 7GB-class files: do NOT raise caps blindly —
+- Databases >~100MB or hot 7GB-class files: do NOT raise caps blindly -
   each version is a full copy until chunked blobs exist. Prefer dumps.
 
 ## Retention, GC, scheduler (MUST understand before running)
@@ -56,18 +56,18 @@ server is the trust model); there are no keys to manage.
 ## Disaster recovery (total local loss), in order
 
 1. Reinstall, `POST /config/remote/adopt {url, username, password,
-   directory}` — takes over the old remote directory.
-2. `POST /admin/reindex` (202 + poll `GET /admin/reindex/{id}`) — rebuilds
+   directory}` - takes over the old remote directory.
+2. `POST /admin/reindex` (202 + poll `GET /admin/reindex/{id}`) - rebuilds
    the index from manifests; everything returns `durable`.
 3. Restore (single/bulk/point-in-time). Blobs stream from WebDAV on demand.
    SQLite restores are integrity-checked; failures refuse with `unrestorable`.
 
 ## Destructive actions (double-check, dry-run first)
 
-- `POST /admin/purge-remote {"today": "dd-mm-yyyy"}` — wipes this
+- `POST /admin/purge-remote {"today": "dd-mm-yyyy"}` - wipes this
   installation's remote `blobs/`+`manifests/` async (202 + counts, poll
   status). Only the claimed directory is ever touched. No local files harmed.
-- `POST /forget {"path", "dry_run"}` — deletes local history under a path.
+- `POST /forget {"path", "dry_run"}` - deletes local history under a path.
 - Restores: always dry-run (`POST /restores` → plan), then
   `POST /restores/{id}/execute`. Pre-restore snapshots make every restore
   undoable. Targets must resolve inside `$HOME`/roots; symlinks refused.