chore(okr): bump 1.6.0 (OKF second brain) + CLAUDE.md/README/CHANGELOG docs

Bump 1.5.0 -> 1.6.0 across plugin.json, CLAUDE.md title, okr-offentlig-sektor SKILL.md, README badge. README version-history row + Under-the-Hood Skills table; CHANGELOG 1.6.0 entry. CLAUDE.md gains OKF Knowledge Layout section (two-root model, okf-index/okf-check/compose-org-profile, lib/frontmatter), second skill in Skills table, and two architecture lines.

Ref-count: kept '16 domain reference files' (correct -- freshen-references scores 16, excludes okr-quality-rubrics.md as the scoring instrument; 17 is the directory total). Tightened CLAUDE.md:20 wording to '16 domain' for clarity; did NOT apply the plan's 16->17 (would contradict the command). References dir untouched (SC9). Verify: node --test 55/55; all version surfaces 1.6.0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SFW5scLL7oEwWWTv1fPQG6

CHANGELOG.md

@@ -5,6 +5,21 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.6.0] - 2026-06-26
+
+### Added
+- **`okr-second-brain-search`-skill** — on-demand retrieval over en OKF-kompatibel markdown-wiki (`.claude/okr/` prosjekt + `~/.claude/okr/org/` home) via native Glob/Read/Grep, i fri chat OG under `/okr:*`-kommandoer. Semantisk dekomponering med opptil 3 query-variasjoner; ingen for-injeksjon av alt innhold.
+- **OKF-frontmatter på alle kontekstfiler** — org-profil (`type: Organisasjonsprofil`) og tre-skrivere (`type: Tildelingsbrev`/`Virksomhetsplan`/`Overordnede OKR`/`OKR`/`Retrospektiv`/`Status`) emitterer ekte OKF-schema (Title-Case `type` + `resource`/`title`/`description`/`tags`/`timestamp`).
+- **`scripts/okf-index.mjs`** — genererer `index.md` per nivå (verbatim OKF-format `* [title](link) - description`) per bundle-rot.
+- **`scripts/okf-check.mjs`** — validerer at hver konsept-fil bærer `type:`; rapporterer `okf_version` per rot.
+- **`scripts/compose-org-profile.mjs`** — bygger nestet org-profil-YAML med top-level OKF-nøkler før pipe til `write-org-profile.mjs`.
+- **`lib/frontmatter.mjs`** — delt frontmatter-parser/skriver; konsoliderer duplisert parse-logikk i begge hooks og fikser comment-leak på usiterte verdier.
+
+### Changed
+- **`inject-okr-context.mjs` splittet** — for-injiserer ikke lenger hele kontekstfil-enumerasjonen; emitterer kjerne-profil + én resolvert peker til `index.md` (< 512 B, uavhengig av filantall). Retrieval skjer on-demand via skill.
+- **`/okr:analyse`** leser `historikk/` direkte (Glob/Read) etter hook-splitten.
+- **Begge hooks** ruter frontmatter-parsing gjennom delt `lib/frontmatter.mjs`.
+
 ## [1.5.0] - 2026-06-26
 
 ### Added