Sync README Usage block with current --help

The static usage example in README.md was added in milestone 1 and
hand-maintained. When -C/--config landed in the JSON-config-file
commit, printHelp() was updated but this block wasn't. This commit
brings them back in sync and adds the precedence line.

README.md

@@ -75,17 +75,23 @@ Usage: move [options]
 Options:
   -h, --help                      Show this help and exit.
   -v, --version                   Print version and exit.
+  -C, --config <path>             Load defaults from a JSON config file.
+                                  Default path: see the Configuration section.
   -m, --move-interval <seconds>   Idle time before a sweep fires. Default: 240.
   -c, --check-interval <seconds>  Cursor poll cadence. Default: 10.
   -d, --step-delay <ms>           Pause between synthetic steps. Default: 50.
   -n, --step-count <pixels>       Steps per sweep. Default: 250.
   -V, --verbose                   Log every sweep, interrupt, and bounds event
                                   (default prints only the startup banner).
+
+Precedence (highest wins): CLI flags > config file > built-in defaults.
 ```
 
-Numeric overrides are layered onto the defaults via `resolveConfig` in
-`src/config.ts`; time-valued inputs (`-m`, `-c`) are expressed in seconds
-at the CLI boundary and converted to milliseconds internally.
+Run `move --help` for the resolved default config-file path on your
+system. Numeric overrides are layered onto the defaults via
+`resolveConfig` in `src/config.ts`; time-valued inputs (`-m`, `-c`) are
+expressed in seconds at the CLI boundary and converted to milliseconds
+internally.
 
 Logging is **quiet by default**: only the startup banner ("Teams Status
 Keeper started…") and any error from an unhandled rejection print on a