feat(mcp-cli): add a `gittensory-mcp tools` command that lists every stdio tool + description

[JSONbored]

There is no CLI affordance to enumerate the MCP tools the local stdio server exposes; a user must start --stdio and speak MCP. The stdio server registers all tools in one place (packages/gittensory-mcp/bin/gittensory-mcp.js, server.registerTool calls from line 328) but the descriptors aren't reusable for a list command. Add a tools command (and --json) that prints name + one-line description for each registered tool.

Deliverables

• Refactor the stdio tool descriptors into a small array/record so both registration and the new command read one source of truth (keep behavior identical)
• Add a tools top-level command that prints name + description; support --json
• Add tools to CLI_COMMAND_SPEC for shell-completion and to printHelp()
• CLI test asserting the count matches the number of registered tools and each has a non-empty description

References

• packages/gittensory-mcp/bin/gittensory-mcp.js:328
• packages/gittensory-mcp/bin/gittensory-mcp.js:26
• packages/gittensory-mcp/bin/gittensory-mcp.js:1389

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size: S · held for later release (gittensor:feature once activated)

[linear-code]

JSO-2334