📝 docs: rename agent changelog for clarity

- Rename CHANGELOG.md to AGENT_CHANGELOG.md
- Better reflects purpose as agent contribution tracker
- Distinguishes from software changelog files
- Update all references in ADR and documentation
- Maintain consistency with AGENTS.md naming

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

CHANGELOG.md

@@ -1,157 +0,0 @@
-# DanceLessonsCoach Agent Improvement Log
-
-This file tracks the agent's contributions and decisions. Kept compact and iterative.
-
-## Current Focus (2026-04-04)
-
-### Active Configuration
-- **Agent**: DanceLessonsCoachProgrammer
-- **Location**: `/Users/gabrielradureau/Work/Vibe/.mistral/dancelessonscoachprogrammer-agent.toml`
-- **Status**: Fully operational with workflow constraints
-
-### Recent Decisions
-- ✅ Use existing `cli` system prompt with custom overrides
-- ✅ Enable web tools for research (web_search, web_fetch)
-- ✅ Restrict git commands (no add/commit/push/merge/rebase)
-- ✅ Require ADR documentation for all architectural decisions
-
-## Workflow Constraints
-
-### Always Ask Before
-- Adding libraries/frameworks
-- Major architectural changes
-- Breaking changes
-
-### Always Check
-- `adr/` folder for existing decisions
-- Roadmap alignment
-- BDD scenario coverage
-
-### Always Document
-- New ADRs in `adr/` folder
-- Feature changes in CHANGELOG.md
-- Test scenarios in `features/`
-
-## Agent Session Guide
-
-### Starting a Session
-```bash
-cd /Users/gabrielradureau/Work/Vibe/DanceLessonsCoach
-vibe start --agent dancelessonscoachprogrammer
-```
-
-### Example Workflow
-```
-🤖 "Need to add library X. Approve?"
-👤 "Yes, document in ADR first"
-🤖 Creates adr/00XX-library-x.md
-🤖 Implements with BDD tests
-🤖 Updates CHANGELOG.md
-```
-
-## Implementation History
-
-### 2026-04-04 - API v2 Implementation
-- ✅ Added `/api/v2/greet` POST endpoint with JSON request/response
-- ✅ Implemented `ServiceV2` with "Hello my friend <name>!" greeting format
-- ✅ Added `api.v2_enabled` feature flag (default: false)
-- ✅ Extended BDD tests to cover v2 scenarios
-- ✅ Maintained full backward compatibility with v1 API
-- ✅ Added `DLC_API_V2_ENABLED` environment variable support
-- ✅ Created ADR [0010-api-v2-feature-flag.md](adr/0010-api-v2-feature-flag.md)
-- ✅ Updated configuration system to support API versioning
-- ✅ Added comprehensive test coverage for both enabled and disabled states
-
-### 2026-04-04 - Input Validation Implementation
-- ✅ Selected go-playground/validator for input validation
-- ✅ Created ADR [0011-validation-library-selection.md](adr/0011-validation-library-selection.md)
-- ✅ Added `pkg/validation/` package with custom validator wrapper
-- ✅ Implemented request validation for v2 API endpoints
-- ✅ Added structured validation error responses
-- ✅ Extended BDD tests to cover validation scenarios
-- ✅ Added validation for name field (max length: 100 characters)
-- ✅ Maintained graceful degradation when validator fails to initialize
-- ⚠️ **REMINDER**: Use `./scripts/build.sh` instead of `go build` directly for consistent builds
-
-## Compact History (Last 5 Entries)
-
-### 2026-04-04
-- Configured agent with workflow constraints
-- Enabled web research tools
-- Restricted git operations
-- Documented in adr/0010-agent-configuration-relationship.md
-
-### 2026-04-04
-- Added bdd_testing skill (updated to match validated implementation)
-- Added commit_message skill (Gitmoji validation)
-- Added skill_creator skill (framework)
-
-### 2026-04-04
-- Implemented BDD testing with Godog
-- Created features/greet.feature and features/health.feature
-- Added pkg/bdd/ with test server and steps
-
-### 2026-04-04
-- Added comprehensive ADR documentation
-- Created adr/0001-0009 covering all major decisions
-- Enhanced AGENTS.md with complete project documentation
-
-### 2026-04-04
-- Established project structure
-- Implemented core Greet service
-- Added Chi router and Zerolog logging
-- Created CLI and web server interfaces
-
-## Maintenance
-
-**Compaction Rule**: Keep only last 5 entries. Older history archived in git.
-
-**Archiving**: When compaction needed:
-```bash
-git log --oneline -- CHANGELOG.md > CHANGELOG_archive.md
-echo "## Compact History (Last 5 Entries)" > CHANGELOG.md
-# Add last 5 entries from git history
-git log -5 --pretty=format:"### %ad%n- %s%n" -- CHANGELOG.md >> CHANGELOG.md
-```
-
-## 2026-04-05 - OpenAPI Documentation Implementation
-
-### ✅ Completed
-- **OpenAPI/Swagger Integration**: Added comprehensive API documentation using swaggo/swag
-- **Embedded Documentation**: OpenAPI spec embedded in binary using `//go:embed` directive
-- **Interactive Swagger UI**: Available at `/swagger/` with try-it-out functionality
-- **Code Generation**: Added `//go:generate` directive for easy documentation regeneration
-- **Clean Structure**: Documentation in `pkg/server/docs/` (gitignored)
-
-### 📝 Changes
-- `cmd/server/main.go`: Added swagger metadata annotations
-- `pkg/greet/api_v1.go`: Documented v1 endpoints and models
-- `pkg/greet/api_v2.go`: Documented v2 endpoint
-- `pkg/server/server.go`: Added embed directive and swagger routes
-- `.gitignore`: Added `pkg/server/docs/`
-- `go.mod/go.sum`: Added swaggo dependencies
-
-### 🔧 Workflow
-```bash
-# Generate documentation
-go generate ./pkg/server/
-
-# Access documentation
-# Swagger UI: http://localhost:8080/swagger/
-# OpenAPI spec: http://localhost:8080/swagger/doc.json
-```
-
-### 📚 Documentation
-- All API endpoints documented with summaries, descriptions, parameters
-- Request/response models with examples
-- Validation rules and error responses
-- Tags for logical grouping
-
-## References
-
-- **Agent Config**: `/Users/gabrielradureau/Work/Vibe/.mistral/dancelessonscoachprogrammer-agent.toml`
-- **ADR Pattern**: `/adr/README.md`
-- **BDD Guide**: `/pkg/bdd/README.md`
-- **Project Docs**: `/AGENTS.md`
-- **Mistral Vibe Docs**: https://docs.mistral.ai/mistral-vibe/introduction
-- **Mistral Vibe GitHub**: https://github.com/mistralai/mistral-vibe