Bring the docs up to what changed: reload, corrections, flags, durability

An audit after 0.10.1 found the docs behind the code. architecture.md named no reload command
(#120) and still said a changed title was picked up, false since #96 until #141; it now says
what a scan writes again, and what the Directory page's endpoint sends (#142). cli.md lacked
add's --list and --category, and that add, rm and import tell a running daemon to read the
catalogue again. users.md did not mention Currently Listening or its search (#127).
configuration.md says that ipx no longer waits for the disk on each write, on SQLite or Postgres
(#135, #140), and what that can lose.

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

docs/configuration.md

@@ -27,6 +27,12 @@ config.toml's default location is `$XDG_CONFIG_HOME/ipx/config.toml`
 Postgres database instead. Back SQLite up by copying `state.db` while the daemon is stopped, or
 with `sqlite3 state.db .backup`; back Postgres up with `pg_dump`.
 
+ipx does not wait for the disk to confirm each write: SQLite syncs at checkpoints
+(`synchronous=NORMAL`), and ipx's own Postgres sessions set `synchronous_commit=off`, which leaves
+other databases on the server as they are. Waiting made a scan take most of a second a feed. A
+crash of ipx loses nothing; a power cut, or a crash of the Postgres server, can lose the last moment
+of changes, a read mark or a saved position, and never corrupts the database.
+
 ## `[general]`
 
 ```toml