daily: nip-research-agent NIP-42 update

- Research NIP-42 compliance.
- Update NIP_INVENTORY.md (NIP-42: Non-compliant).
- Add artifacts/nips/42.md.
- Generate nip-report-2026-02-21.md.

Co-authored-by: PR0M3TH3AN <[email protected]>

decisions/DECISIONS_2026-02-21_nip-research-agent.md

@@ -0,0 +1,16 @@
+# Decisions: NIP-42 Research
+
+**Date:** 2026-02-21
+
+## NIP Selection
+- **Decision:** Focus on NIP-42.
+- **Rationale:** Currently marked as "Unknown" in inventory. Relay authentication is a critical feature for private or paid relays.
+
+## Implementation Status
+- **Initial Observation:** `grep` for "AUTH" in `js/nostr/client.js` showed no relevant results for relay authentication command handling.
+- **Codebase Analysis:**
+  - `js/nostr/client.js` and `js/nostr/managers/ConnectionManager.js` use `SimplePool` from `nostr-tools`.
+  - `nostr-tools` v2.19.4 is used.
+  - No listeners for `"AUTH"` messages found on relay instances.
+  - No logic to sign Kind 22242 events found.
+- **Conclusion:** NIP-42 is **Non-compliant**.