docs: add missing skills, CLI commands, and messaging env vars
Complete the documentation gaps identified in the previous audit:
Skills catalogs:
- skills-catalog.md: Add 7 missing bundled skills — data-science/
jupyter-live-kernel, dogfood/hermes-agent-setup, inference-sh/
inference-sh-cli, mlops/huggingface-hub, productivity/linear,
research/parallel-cli, social-media/xitter
- optional-skills-catalog.md: Add 8 missing optional skills —
blockchain/base, creative/blender-mcp, creative/meme-generation,
mcp/fastmcp, productivity/telephony, research/bioinformatics,
security/oss-forensics, security/sherlock
CLI commands reference:
- cli-commands.md: Add full documentation for hermes mcp (add/remove/
list/test/configure) and hermes plugins (install/update/remove/list)
Messaging platform docs:
- discord.md: Add DISCORD_REQUIRE_MENTION and
DISCORD_FREE_RESPONSE_CHANNELS to manual config env vars section
- signal.md: Add SIGNAL_ALLOW_ALL_USERS to env var reference table
- slack.md: Add SLACK_HOME_CHANNEL_NAME to config section
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