chore(release): bump v1.18.1 [skip-docs]

Version 1.18.1 in plugin.json, the README badge and SECURITY.md, with the
changelog entry. The README screenshot table notes that the dark
onboarding variant was removed. Not tagged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.18.1] - 2026-09-23
+
+### Changed
+- Replaced sector-specific example material with generic, fictitious examples in reference files, test fixtures, the playground and one design document. Legal text is unchanged, and so are test semantics.
+- The playground demo project (17 fixtures and the embedded demo state) now tells one consistent story: a municipal customer chatbot that pre-screens housing-benefit applications.
+- Cosmo persona removed from the reference corpus (R13, R13b) and from the plugin surface: skills, commands, README, CLAUDE.md and NOTICE (R14). `check-cosmo-gate.mjs` gained a G4 clause for the plugin surface; persona count in the corpus and on the plugin surface is 0.
+
+### Removed
+- Four screenshots (`01-onboarding-empty-dark.png` in the v1.10.0, v1.11.0, v1.14.0 and v1.15.0 sets) that showed outdated placeholder text.
+
+### Added
+- `tests/kb-update/test-excluded-terms.test.mjs`: a gate that fails when a tracked text file contains a term from a local-only list kept by the maintainer. Without the list the gate is skipped.
+
 ## [1.18.0] - 2026-09-12
 
 **Korrekthetsprogrammet gikk fra dormant mekanisme til utført måling.** v1.17.0 la substratet (Spor 1 — reference-kontrakten påført korpuset); denne utgivelsen *kjørte* mekanismen: hele korpus-dømmepasset (R7.1–R7.5) er utført over alle 243 aldri-verifiserte reference-filer, og flag→fiks-loopen (R11) er i eksekvering på flaggene det produserte. Sideløpende injiserte en uavhengig kryssmodell-review (2026-07-09, 7 BLOCKER / 15 MAJOR) RX-serien, som avdekket at pluginen lastet kunnskapsbasen feil i **installert** modus — relative KB-stier resolverer kun i dev-modus, så subagentene mistet KB-lasten når pluginen ble installert fra katalogen. Det er den ene endringen i denne utgivelsen som var synlig for en bruker uten å lese ledgeren.