docs: raw fetch --html record and kb/CONTRACT.md path budget follow the folder accept (#112)

Files changed:
- CHANGES.md
- VERSION
- kb/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/commands/raw_cmd.py

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

tools/CONTRACT.md

@@ -1415,14 +1415,14 @@ Capture a web page the user names into `incoming/`: the HTML as received plus a
 - 1    The URL is not `http`/`https` (also after a redirect), or neither or both of `<url>` and `--html` were given
 - 1    A target file already exists in `incoming/`
 - 1    The server answered with an HTTP error, could not be reached, took longer than 30 s, or sent more than 25 MiB
-- 1    raw fetch --html: `--url` is missing, the file is not under `incoming/` or does not exist, or `incoming/<stem>.md` already exists
+- 1    raw fetch --html: `--url` is missing, the file is not directly in `incoming/` or does not exist, or `incoming/<stem>.md` already exists
 
 **ON FAILURE**
 
 - The URL is not `http`/`https` (also after a redirect), or neither or both of `<url>` and `--html` were given -> Fix the call and retry once. A local file is dropped into `incoming/` by hand, not fetched
 - A target file already exists in `incoming/` -> Nothing was written or overwritten. Accept or remove what is there, or pass `--name <stem>`, then retry once
 - The server answered with an HTTP error, could not be reached, took longer than 30 s, or sent more than 25 MiB -> Nothing was written. An HTTP 4xx is not fixed by retrying - check the URL with the user; for a paywall or login, save the page in a browser and use `--html`. An unreachable host or a timeout may be retried once
-- raw fetch --html: `--url` is missing, the file is not under `incoming/` or does not exist, or `incoming/<stem>.md` already exists -> Fix the named argument and retry once - nothing was written
+- raw fetch --html: `--url` is missing, the file is not directly in `incoming/` or does not exist, or `incoming/<stem>.md` already exists -> Fix the named argument and retry once - nothing was written. A saved page inside a subdirectory of `incoming/` is moved up into `incoming/` first
 
 **NEVER**
 

tools/chemenu/commands/raw_cmd.py

@@ -1229,9 +1229,10 @@ def _fetch_html_file(html: Path, source_url: Optional[str]) -> None:
         ),
         cli_contract.Failure(
             label="raw fetch --html",
-            cause="`--url` is missing, the file is not under `incoming/` or does not exist, or "
-            "`incoming/<stem>.md` already exists",
-            reaction="Fix the named argument and retry once - nothing was written",
+            cause="`--url` is missing, the file is not directly in `incoming/` or does not "
+            "exist, or `incoming/<stem>.md` already exists",
+            reaction="Fix the named argument and retry once - nothing was written. A saved page "
+            "inside a subdirectory of `incoming/` is moved up into `incoming/` first",
         ),
     ),
     examples=(