chore: release v0.6.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: singularityjason

CHANGELOG.md

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+# Changelog
+
+## [0.6.0] - 2026-03-14
+
+### Added
+- Community reputation via live NIP-85 trust attestation sync
+- Auto-attestation: automatically publish trust scores after N transactions per vendor
+- Know Your Agent (KYA) attestations for agent identity verification
+- LNURL-auth session storage and lookup
+- Structured compliance report generation and export
+- Compliance report L402 gateway endpoint (/ln/compliance-report)
+- Memory marketplace: discover remote gateways via Nostr relays
+- GatewayClient for querying remote gateways with automatic L402 payment
+- DNS-based gateway discovery via .well-known/lightning-memory.json
+- `lightning-memory-manifest` CLI command for generating gateway manifests
+- 8 new MCP tools: ln_trust_attest, ln_agent_attest, ln_agent_verify,
+  ln_auth_session, ln_auth_lookup, ln_compliance_report,
+  ln_discover_gateways, ln_remote_query (13 → 21 total)