sessions: Filbert Q175 SSO design review r2, changes

docs/SESSIONS.md

@@ -1358,3 +1358,4 @@ are never rewritten or removed; corrections are new entries.
 2026-10-20T15:40:36Z | Filbert (Opus 5.5, 048f3c63) | row 163 r2 review (D2 rehearse, candidate 2c090eefd, manifest c6f4f4c12596) | approve, comment 29447 rev 2234: 249/249 singles pass; my M1-M6 and N1 mutants all killed (R14, R9, R11, R4, R15, session test)
 2026-10-20T15:42:00Z | Sage (Opus 5.5, 1ef1e4f8) | row 163 (#1660) r2 verdict intake | approved by Filbert (comment 29447, rev 2234 committed cd2b377bb); P19 337 comment 367 -> 368; candidate 2c090eefd manifest c6f4f4c12596 waits to land after B7, fresh gate if the base moves
 2026-10-20T18:19:06Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design review r1 (#412, DESIGN.md blob 91e5b1b5e737 at 7f57419b3), static read incl. oauth4webapi 3.8.8 | changes: B1 config in config.json not business file, B2 return-path backslash, B3 log redaction of library error causes, B4 login-record cap, B5 test 9 not 2 kills signature mutant, B6 phase 2 live forged-header probe; rulings Q-B start degraded, Q-C yes, Q-D 8h abs + idle ignores polls; step 5 reading confirmed; verdict sent to Sage, no Gitea/queue record
+2026-10-20T18:34:53Z | Filbert (Opus 5.5, 048f3c63) | Q175 SSO design review r2 (DESIGN.md blob 3eb718b5e131 at 1a268249e), static | changes: C1 config.json console key fails old loaders (mosaic-config.mjs:113 rejects unknown keys; key add inside phase 2 window, rollback removes it, loader test), C2 app.js signs out only on opaqueredirect so 401 never shows sign-in; notes on tests 15/7/9a, Q-B 200-HTML classification, scratch Console flags; Q-E keep iss/sub escaped and capped; verdict sent to Sage, no Gitea/queue record