feat: Production readiness improvements for WHOOSH council formation

Major security, observability, and configuration improvements:

## Security Hardening
- Implemented configurable CORS (no more wildcards)
- Added comprehensive auth middleware for admin endpoints
- Enhanced webhook HMAC validation
- Added input validation and rate limiting
- Security headers and CSP policies

## Configuration Management
- Made N8N webhook URL configurable (WHOOSH_N8N_BASE_URL)
- Replaced all hardcoded endpoints with environment variables
- Added feature flags for LLM vs heuristic composition
- Gitea fetch hardening with EAGER_FILTER and FULL_RESCAN options

## API Completeness
- Implemented GetCouncilComposition function
- Added GET /api/v1/councils/{id} endpoint
- Council artifacts API (POST/GET /api/v1/councils/{id}/artifacts)
- /admin/health/details endpoint with component status
- Database lookup for repository URLs (no hardcoded fallbacks)

## Observability & Performance
- Added OpenTelemetry distributed tracing with goal/pulse correlation
- Performance optimization database indexes
- Comprehensive health monitoring
- Enhanced logging and error handling

## Infrastructure
- Production-ready P2P discovery (replaces mock implementation)
- Removed unused Redis configuration
- Enhanced Docker Swarm integration
- Added migration files for performance indexes

## Code Quality
- Comprehensive input validation
- Graceful error handling and failsafe fallbacks
- Backwards compatibility maintained
- Following security best practices

🤖 Generated with [Claude Code](https://claude.ai/code)

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

vendor/github.com/golang-migrate/migrate/v4/.goreleaser.yml

@@ -0,0 +1,103 @@
+project_name: migrate
+before:
+  hooks:
+    - go mod tidy
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - amd64
+      - arm
+      - arm64
+      - 386
+    goarm:
+      - 7
+    main: ./cmd/migrate
+    ldflags:
+      - '-w -s -X main.Version={{ .Version }} -extldflags "static"'
+    flags:
+      - "-tags={{ .Env.DATABASE }} {{ .Env.SOURCE }}"
+      - "-trimpath"
+nfpms:
+  - homepage: "https://github.com/golang-migrate/migrate"
+    maintainer: "dhui@users.noreply.github.com"
+    license: MIT
+    description: "Database migrations"
+    formats:
+      - deb
+    file_name_template: "{{ .ProjectName }}.{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+dockers:
+  - goos: linux
+    goarch: amd64
+    dockerfile: Dockerfile.github-actions
+    use: buildx
+    ids:
+      - migrate
+    image_templates:
+      - 'migrate/migrate:{{ .Tag }}-amd64'
+    build_flag_templates:
+      - '--label=org.opencontainers.image.created={{ .Date }}'
+      - '--label=org.opencontainers.image.title={{ .ProjectName }}'
+      - '--label=org.opencontainers.image.revision={{ .FullCommit }}'
+      - '--label=org.opencontainers.image.version={{ .Version }}'
+      - "--label=org.opencontainers.image.source={{ .GitURL }}"
+      - "--platform=linux/amd64"
+  - goos: linux
+    goarch: arm64
+    dockerfile: Dockerfile.github-actions
+    use: buildx
+    ids:
+      - migrate
+    image_templates:
+      - 'migrate/migrate:{{ .Tag }}-arm64'
+    build_flag_templates:
+      - '--label=org.opencontainers.image.created={{ .Date }}'
+      - '--label=org.opencontainers.image.title={{ .ProjectName }}'
+      - '--label=org.opencontainers.image.revision={{ .FullCommit }}'
+      - '--label=org.opencontainers.image.version={{ .Version }}'
+      - "--label=org.opencontainers.image.source={{ .GitURL }}"
+      - "--platform=linux/arm64"
+
+docker_manifests:
+- name_template: 'migrate/migrate:{{ .Tag }}'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+- name_template: 'migrate/migrate:{{ .Major }}'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+- name_template: 'migrate/migrate:latest'
+  image_templates:
+  - 'migrate/migrate:{{ .Tag }}-amd64'
+  - 'migrate/migrate:{{ .Tag }}-arm64'
+archives:
+  - name_template: "{{ .ProjectName }}.{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}"
+    format_overrides:
+      - goos: windows
+        format: zip
+checksum:
+  name_template: 'sha256sum.txt'
+release:
+  draft: true
+  prerelease: auto
+source:
+  enabled: true
+  rlcp: true
+  format: zip
+changelog:
+  skip: false
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+      - Merge pull request
+      - Merge branch
+      - go mod tidy
+snapshot:
+  name_template: "{{ .Tag }}-next"