review: M5d-1 epochs and compaction

Co-Authored-By: Grok 4.6 <noreply@x.ai>

AGENTS.md

@@ -96,6 +96,8 @@ These come from defects found in review. The evidence is in `docs/implementer-le
   does not match, look at `git diff <file>` for your own earlier edit, then stop and report; never
   anchor the edit on another line.
 - Write your log row from `git diff` after staging, naming only what the diff shows.
+- Add the log row immediately under the table header (newest first). Do not insert it by date
+  among older rows.
 - After `gate: ok`, do not run `cargo test --workspace` only to count tests. If HEAD already has
   this task's commit and a `done` row, stop.
 
@@ -129,9 +131,10 @@ Useful while working: `cargo test -p <crate> --test <file>` runs one test file,
 
 ## The implementer log
 
-Before you commit, add one row to the table in `docs/implementer-log.md` and include the file in
-the commit. Be honest: the log is how the owner judges the process, and a wrong row is worse than a
-bad one.
+Before you commit, add one row immediately under the header of the table in
+`docs/implementer-log.md` (newest first) and include the file in the commit. Do not insert the
+row by date among older rows. Be honest: the log is how the owner judges the process, and a wrong
+row is worse than a bad one.
 
 | Column | What to write |
 |---|---|