docs: update CHANGELOG for v1.1.0 release

Separate v1.0.0 (core features) from v1.1.0 (specs, community files,
setup.sh hardening). Fix v1.0.0 date to actual initial release date.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: MehmetGoekce

CHANGELOG.md

@@ -5,7 +5,33 @@ All notable changes to this project will be documented in this file.
 Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [1.0.0] - 2026-04-10
+## [1.1.0] - 2026-04-10
+
+### Added
+
+- 7 OpenSpec specifications with 162 EARS requirements and 66 BDD scenarios
+  - `ingest.md` — 5-phase source processing pipeline
+  - `query.md` — Search, synthesis, write-back, source attribution
+  - `lint.md` — 9 health checks with auto-fix rules
+  - `schema.md` — Page types, property validation, format rules
+  - `config.md` — Configuration loading and error handling
+  - `setup.md` — Interactive installer specification
+  - `l1-l2-routing.md` — L1/L2 boundary decision logic
+- GitHub issue templates (bug report, feature request)
+- Pull request template with dual-tool testing checklist
+- SECURITY.md with responsible disclosure process
+- `.gitignore` for editor and OS files
+- CHANGELOG.md
+
+### Fixed
+
+- `setup.sh`: Add prerequisite checks for python3 and git
+- `setup.sh`: Add `set -eo pipefail` for stricter error handling
+- `setup.sh`: Validate namespace names (letters, numbers, hyphens only)
+- `setup.sh`: Skip existing wiki pages instead of silently overwriting
+- `setup.sh`: Prompt before overwriting existing `llm-wiki.yml`
+
+## [1.0.0] - 2026-04-07
 
 First stable release.
 
@@ -19,14 +45,12 @@ First stable release.
 - L1/L2 dual-layer cache architecture (CPU cache metaphor)
 - Templates for both Logseq (outliner) and Obsidian (flat markdown)
 - Schema with 5 page types: Entity, Project, Knowledge, Feedback, Hub
-- 7 OpenSpec specifications (162 requirements, 66 BDD scenarios)
-- GitHub community files (issue templates, PR template, security policy)
 - `config.example.yml` for reference configuration
 
 ### Security
 
 - Credential leak detection (lint rule 6) scans for tokens, passwords, secrets
 - L1/L2 security boundary: credentials stay in L1 (git-excluded), wiki is git-tracked
-- SECURITY.md with responsible disclosure process
 
+[1.1.0]: https://github.com/MehmetGoekce/llm-wiki/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/MehmetGoekce/llm-wiki/releases/tag/v1.0.0