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/ajg/form/pre-commit.sh

@@ -0,0 +1,18 @@
+#!/bin/bash -eu
+
+# TODO: Only colorize messages given a suitable terminal.
+# FIXME: Handle case in which no stash entry is created due to no changes.
+
+printf "\e[30m=== PRE-COMMIT STARTING ===\e[m\n"
+git stash save --quiet --keep-index --include-untracked
+
+if go build -v ./... && go test -v -cover ./... && go vet ./... && golint . && travis-lint; then
+  result=$?
+  printf "\e[32m=== PRE-COMMIT SUCCEEDED ===\e[m\n"
+else
+  result=$?
+  printf "\e[31m=== PRE-COMMIT FAILED ===\e[m\n"
+fi
+
+git stash pop --quiet
+exit $result