docs: register Filbert row 147 round 1 review (approve)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

docs/SESSIONS.md

@@ -1032,3 +1032,4 @@ are never rewritten or removed; corrections are new entries.
 2026-10-15T23:09:16Z | Filbert (Opus 5.5, 048f3c63) | row 142 r2 review (#1636, Researcher, rebase onto dda7e31b0) | approve, comment 28638, rev 1434, candidate bb635c95...638c; patch lines equal r1 except the TOOLS.md rewrap; verbs/follow/tester 6/6, limits 4/4
 2026-10-15T23:17:49Z | Filbert (Opus 5.5, 048f3c63) | row 140 r1 review (#1634, Researcher, staff.request and request_staff) | changes, comment 28639, rev 1435, candidate df9e3fea...aaaf; code correct, but the only-from-pm tests don't separate definitions from instance names (2 own mutants survive 7/7); 10 files singly green, launcher 18/18
 2026-10-15T23:23:12Z | Filbert (Opus 5.5, 048f3c63) | row 146 round 1 review (#1640, Dewey): rebuilt 616f953f on dda7e31b0, 13 test files singly, 3 own mutants (M1 survives, evidence only) | approve, comment 28641, rev 1438; notes: notice routed holder unpinned, notice for a non-launch instance
+2026-10-15T23:32:20Z | Filbert (Opus 5.5, 048f3c63) | row 147 round 1 review (#1641, Rocko, project layout), candidate a7f53bc5 on fba879f6a | approve, comment 28643, rev 1443; 6 non-blocking notes (failed init not retryable, repo inside another project root, spec test reason, human-author test, undeclared exit code, 146 rebase); 7 files singly green, 8 own mutants (2 survive, notes 3 and 4); no slot