fix: network property means any network reach, not only HTTP (#144)

Files changed:
- CHANGES.md
- VERSION
- tools/CONTRACT.md
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/git_publish.py
- tools/chemenu/commands/upstream_cmd.py
- tools/chemenu/commands/version_cmd.py
- tools/chemenu/tests/test_cli.py
- tools/chemenu/version.py

tools/chemenu/version.py

@@ -348,13 +348,13 @@ def fetch_latest(
     """The version the release feed reports as latest.
 
     The network call sits behind `fetcher` so every caller above this line -
-    and every test - can run without a network. This is the one place in
-    `wikitool` that talks to a remote host, and only two commands reach it:
-    `version check`, whose whole job it is, and `version notes` on a
-    *distributed* instance, whose local `CHANGES.md` is a stub with no entry to
-    print (see `fetch_latest_notes`). Neither is implicit - `check` exists for
-    the call, and `notes` announces the URL it is asking before it asks, on
-    stderr, and takes `--offline` for a caller that wants none of it.
+    and every test - can run without a network. This is the one place that
+    talks to the **release feed**, and only two commands reach it: `version
+    check`, whose whole job it is, and `version notes` on a *distributed*
+    instance, whose local `CHANGES.md` is a stub with no entry to print (see
+    `fetch_latest_notes`). Neither is implicit - `check` exists for the call,
+    and `notes` announces the URL it is asking before it asks, on stderr, and
+    takes `--offline` for a caller that wants none of it.
     """
     fetch = fetcher or _urlopen_fetch
     try: