Replace the alpha-research CLI skill with direct programmatic Pi tool
registrations via @companion-ai/alpha-hub/lib. Tools connect to alphaXiv's
MCP server through the library and reuse the connection across calls
instead of spawning a new CLI process each time.
Registers: alpha_search, alpha_get_paper, alpha_ask_paper,
alpha_annotate_paper, alpha_list_annotations, alpha_read_code.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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