docs: brief template, landed evidence is plain text with no gzip or binary waiver (mos-1570); doc only

docs/plans/BRIEF-TEMPLATE.md

@@ -59,6 +59,13 @@ fails it on any commit (row 323, mos-1561). A builder whose cli suite
 can't run says so in the row, and the cli suite counts from the lead's
 landing gate.
 
+Evidence that lands with a row is plain text: logs, diffs, manifests. No
+gzip or other binary file, so the lead's push guard runs its binary and
+secret checks with no waiver. If a log is too big, cut it to the lines
+that prove the claim. Or keep it off refactor, in the seat's scratch, and
+cite its path and sha256 in BUILD.md (mos-1570, after row 265's 22 gzip
+logs).
+
 ### Handoffs
 
 Every seat hands off directly (DECISIONS Q210, mos-1221). When the owner