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-jwt/jwt/v5/parser_option.go

@@ -0,0 +1,145 @@
+package jwt
+
+import "time"
+
+// ParserOption is used to implement functional-style options that modify the
+// behavior of the parser. To add new options, just create a function (ideally
+// beginning with With or Without) that returns an anonymous function that takes
+// a *Parser type as input and manipulates its configuration accordingly.
+type ParserOption func(*Parser)
+
+// WithValidMethods is an option to supply algorithm methods that the parser
+// will check. Only those methods will be considered valid. It is heavily
+// encouraged to use this option in order to prevent attacks such as
+// https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/.
+func WithValidMethods(methods []string) ParserOption {
+	return func(p *Parser) {
+		p.validMethods = methods
+	}
+}
+
+// WithJSONNumber is an option to configure the underlying JSON parser with
+// UseNumber.
+func WithJSONNumber() ParserOption {
+	return func(p *Parser) {
+		p.useJSONNumber = true
+	}
+}
+
+// WithoutClaimsValidation is an option to disable claims validation. This
+// option should only be used if you exactly know what you are doing.
+func WithoutClaimsValidation() ParserOption {
+	return func(p *Parser) {
+		p.skipClaimsValidation = true
+	}
+}
+
+// WithLeeway returns the ParserOption for specifying the leeway window.
+func WithLeeway(leeway time.Duration) ParserOption {
+	return func(p *Parser) {
+		p.validator.leeway = leeway
+	}
+}
+
+// WithTimeFunc returns the ParserOption for specifying the time func. The
+// primary use-case for this is testing. If you are looking for a way to account
+// for clock-skew, WithLeeway should be used instead.
+func WithTimeFunc(f func() time.Time) ParserOption {
+	return func(p *Parser) {
+		p.validator.timeFunc = f
+	}
+}
+
+// WithIssuedAt returns the ParserOption to enable verification
+// of issued-at.
+func WithIssuedAt() ParserOption {
+	return func(p *Parser) {
+		p.validator.verifyIat = true
+	}
+}
+
+// WithExpirationRequired returns the ParserOption to make exp claim required.
+// By default exp claim is optional.
+func WithExpirationRequired() ParserOption {
+	return func(p *Parser) {
+		p.validator.requireExp = true
+	}
+}
+
+// WithAudience configures the validator to require any of the specified
+// audiences in the `aud` claim. Validation will fail if the audience is not
+// listed in the token or the `aud` claim is missing.
+//
+// NOTE: While the `aud` claim is OPTIONAL in a JWT, the handling of it is
+// application-specific. Since this validation API is helping developers in
+// writing secure application, we decided to REQUIRE the existence of the claim,
+// if an audience is expected.
+func WithAudience(aud ...string) ParserOption {
+	return func(p *Parser) {
+		p.validator.expectedAud = aud
+	}
+}
+
+// WithAllAudiences configures the validator to require all the specified
+// audiences in the `aud` claim. Validation will fail if the specified audiences
+// are not listed in the token or the `aud` claim is missing. Duplicates within
+// the list are de-duplicated since internally, we use a map to look up the
+// audiences.
+//
+// NOTE: While the `aud` claim is OPTIONAL in a JWT, the handling of it is
+// application-specific. Since this validation API is helping developers in
+// writing secure application, we decided to REQUIRE the existence of the claim,
+// if an audience is expected.
+func WithAllAudiences(aud ...string) ParserOption {
+	return func(p *Parser) {
+		p.validator.expectedAud = aud
+		p.validator.expectAllAud = true
+	}
+}
+
+// WithIssuer configures the validator to require the specified issuer in the
+// `iss` claim. Validation will fail if a different issuer is specified in the
+// token or the `iss` claim is missing.
+//
+// NOTE: While the `iss` claim is OPTIONAL in a JWT, the handling of it is
+// application-specific. Since this validation API is helping developers in
+// writing secure application, we decided to REQUIRE the existence of the claim,
+// if an issuer is expected.
+func WithIssuer(iss string) ParserOption {
+	return func(p *Parser) {
+		p.validator.expectedIss = iss
+	}
+}
+
+// WithSubject configures the validator to require the specified subject in the
+// `sub` claim. Validation will fail if a different subject is specified in the
+// token or the `sub` claim is missing.
+//
+// NOTE: While the `sub` claim is OPTIONAL in a JWT, the handling of it is
+// application-specific. Since this validation API is helping developers in
+// writing secure application, we decided to REQUIRE the existence of the claim,
+// if a subject is expected.
+func WithSubject(sub string) ParserOption {
+	return func(p *Parser) {
+		p.validator.expectedSub = sub
+	}
+}
+
+// WithPaddingAllowed will enable the codec used for decoding JWTs to allow
+// padding. Note that the JWS RFC7515 states that the tokens will utilize a
+// Base64url encoding with no padding. Unfortunately, some implementations of
+// JWT are producing non-standard tokens, and thus require support for decoding.
+func WithPaddingAllowed() ParserOption {
+	return func(p *Parser) {
+		p.decodePaddingAllowed = true
+	}
+}
+
+// WithStrictDecoding will switch the codec used for decoding JWTs into strict
+// mode. In this mode, the decoder requires that trailing padding bits are zero,
+// as described in RFC 4648 section 3.5.
+func WithStrictDecoding() ParserOption {
+	return func(p *Parser) {
+		p.decodeStrict = true
+	}
+}