Add local and NetBox server notes and improve reliability

README.md

@@ -20,7 +20,8 @@ netssh -p 2222 admin@app-server-03 uptime
 - **Interactive TUI** — fuzzy search with live NetBox queries and 300 ms debouncing (start with `netssh`, no arguments)
 - **Recently-used list** — TUI opens with your 10 most-recently-connected hosts, no typing needed
 - **Tag/kind filter** — press `Ctrl+F` in the TUI to filter by `tag:prod` or `kind:vm`
-- **User/port override** — press `e` in the TUI to override the SSH user or port before connecting
+- **User/port override** — press `Ctrl+E` in the TUI to override the SSH user or port before connecting
+- **Server notes** — multiline local notes or optional NetBox comments, available in the TUI and CLI
 - **Persistent cache** — successful lookups are cached to `~/.cache/netssh/hosts.json` for instant shell completion
 - **Full pagination** — `cache refresh` fetches all hosts from NetBox (not just the first 50)
 - **Selective refresh** — `cache refresh --tag prod --kind vm` limits what gets synced
@@ -235,7 +236,9 @@ The TUI opens with your 10 most-recently-connected hosts. Start typing to search
 | `Tab` | autocomplete top result into the search field |
 | `↑` / `↓` | navigate results |
 | `Enter` | connect to selected host |
-| `e` | open inline editor to override user/port before connecting |
+| `Ctrl+E` | open inline editor to override user/port before connecting |
+| `Ctrl+N` | edit local notes for the selected server |
+| `Ctrl+B` | edit NetBox comments for the selected server |
 | `Ctrl+F` | open/close tag and kind filter (`tag:prod kind:vm`) |
 | `Esc` / `Ctrl+C` | quit (or close filter/edit if open) |
 
@@ -247,13 +250,48 @@ Filter: tag:prod kind:vm
 
 Multiple `tag:` values are AND-combined. The filter is applied locally against the cache; when doing a live NetBox search the first tag is also forwarded as a query parameter.
 
-**User/port override** — press `e` on any highlighted host:
+**User/port override** — press `Ctrl+E` on any highlighted host:
 
 ```
 Connect as: admin@my-router:22
 ```
 
-Edit the pre-filled value and press `Enter` to connect. `Esc` cancels. Port 22 is treated as default and omitted from the ssh command.
+Edit the pre-filled value and press `Enter` to connect. `Esc` cancels. The configured default port is pre-filled. An explicit port 22 overrides a different configured default.
+
+### Server notes
+
+Select a server in the TUI and press `Ctrl+N` for local notes, or `Ctrl+B` for
+NetBox comments. Both open a multiline editor: `Ctrl+S` saves, `Esc` cancels.
+Existing text is loaded before editing. A failed save keeps your draft in the editor.
+Local notes and NetBox comments are independent; there is no automatic synchronization.
+
+The CLI also supports reading, replacing, and appending notes:
+
+```sh
+netssh notes set web01 "Maintenance on Friday"
+netssh notes append web01 "Reboot completed"
+netssh notes show web01
+printf 'First line\nSecond line\n' | netssh notes set web01
+netssh notes append web01 --netbox --kind vm "Maintenance completed"
+netssh notes show web01 --netbox --kind vm
+```
+
+`set` replaces the selected note; `append` preserves existing text and adds a new line.
+Omitting the text reads it from standard input. An empty string clears the note.
+For an uncached local host, specify `--kind device` or `--kind vm`; local operations
+work offline. Use the full server name as displayed in the TUI.
+
+Local notes live under `~/.config/netssh/notes/` (`$XDG_CONFIG_HOME` is respected),
+with file permissions `0600` and atomic file replacement. They are keyed by NetBox
+URL, host kind, and hostname, so cache refreshes and `cache clear` preserve them.
+Changing the hostname or NetBox URL creates a separate note identity.
+
+`--netbox` explicitly selects the device/VM's shared `comments` field and requires
+a token with write permissions. Existing comments are loaded before modification;
+ambiguous names are rejected (specify `--kind` where appropriate).
+The client uses the API's ETag/If-Match conflict protection when the server provides
+it; older NetBox versions without ETags use the server's last-write-wins behavior.
+See the [NetBox REST API documentation](https://netbox.readthedocs.io/en/stable/integrations/rest-api/).
 
 ### Cache management