docs: the ingest and maintenance how-tos say the generated indexes, log and provenance do not count toward the Mass-Update Gate (#191)

Files changed:
- docs/how-to/ingest-a-source.md
- docs/how-to/maintain-the-wiki.md

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

docs/how-to/ingest-a-source.md

@@ -43,7 +43,8 @@ what is waiting and names the entry the next bare `Ingest` will take.
 - **Before writing pages**, the agent presents the key takeaways and asks which points matter most
   and what to emphasise. The pages follow your answer.
 - **When it publishes**, a source that touches ten or more files stops at the Mass-Update Gate
-  (exit 42). The agent shows you the file list and the `--confirm` line. Nothing is committed until
+  (exit 42). The generated indexes, `kb/log.md` and `kb/provenance.md` do not count, so a small
+  source goes straight through. The agent shows you the file list and the `--confirm` line. Nothing is committed until
   you approve. [Exit codes and gates](../reference/exit-codes.md) lists every gate.
 
 ## What you get back

docs/how-to/maintain-the-wiki.md

@@ -47,7 +47,8 @@ tools/wikitool sources trace --page "HA Integration"    # which raw files this p
 
 ## Where the agent stops
 
-- **Publishing ten or more files** stops at the Mass-Update Gate (exit 42). A lint pass that repairs
+- **Publishing ten or more files** stops at the Mass-Update Gate (exit 42); the generated indexes,
+  `kb/log.md` and `kb/provenance.md` are not counted. A lint pass that repairs
   many pages does this routinely. The agent shows you the full file list and the `--confirm` line,
   and publishes only after you approve. The token is a digest of that file list, so your approval
   never covers a changeset you did not see.