docs(readme): cross-link external-mcp-clients troubleshooting

Both READMEs now point to the new troubleshooting page so users hitting
"Vault locked" or "DAEMON_UNREACHABLE" find guidance from the entry-
point docs without grepping the source.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: A.R.

README.md

@@ -444,6 +444,12 @@ For deeper internals, see:
 
 ---
 
+## Troubleshooting
+
+- **External MCP clients (Claude Code, Antigravity, Codex CLI, Cursor) hitting "Vault locked":** [docs/troubleshooting/external-mcp-clients.md](docs/troubleshooting/external-mcp-clients.md)
+
+---
+
 ## Find Us
 
 <div align="center">

packages/mcp-server/README.md

@@ -377,6 +377,11 @@ Logging in still goes through the CLI (`npx perplexity-user-mcp login`) — the
 - A browser runtime — any of: real Chrome, Microsoft Edge, Brave, system Chromium, or patchright's bundled Chromium (see the [Browser requirement](#browser-requirement) section)
 - An active Perplexity account (free tier works; Pro/Max unlock reason/research/compute)
 
+## Troubleshooting
+
+- **External MCP clients hitting "Vault locked":** [Troubleshooting external MCP clients](../../docs/troubleshooting/external-mcp-clients.md)
+- **Vault unseal model and recovery:** [docs/vault-unseal.md](../../docs/vault-unseal.md)
+
 ## Issues
 
 Bug reports and feature requests: <https://github.com/Automations-Project/VSCode-Perplexity-MCP/issues>.