docs(external-miner): drop stale prism forthcoming note

[echobt]

Summary

• Remove stale “(miner docs forthcoming)” pin now that public BaseIntelligence/prism has the guide.
• Add miner-facing troubleshoot rows for source-tree zip_base64, tokenizer declaration, and CAP_EXCEEDED.

Test plan

• cargo run -p xtask -- external-docs-check
• Confirm docs/external-miner/prism.md on prism-better already covers 1.4.0 (unchanged here)

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