fix: resolve NostrClient initialization race condition

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

docs/agents/task-logs/weekly/2026-02-14_13-28-00_race-condition-agent_completed.md

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+# Weekly Agent Task Complete: Race Condition Audit
+
+- **Agent**: race-condition-agent
+- **Date**: 2026-02-14
+- **Cadence**: Weekly
+
+## Summary
+Audited `js/nostr/client.js` and identified a critical race condition in the initialization logic where `isInitialized` was set prematurely. Implemented a fix using the `initPromise` pattern and validated it with a new reproduction test.
+
+## Artifacts
+- **Report**: [docs/race-condition-reports/weekly-race-condition-report-2026-02-14.md](../../race-condition-reports/weekly-race-condition-report-2026-02-14.md)
+- **Reproduction Test**: [tests/race/nostr-client-init-race.test.mjs](../../../../tests/race/nostr-client-init-race.test.mjs)
+
+## Next Steps
+- Monitor Sentry for `Cannot read properties of null` errors related to pool access.