MCP language_help always returns empty topics: skillsDir() misses dist/skills

[aszenz]

Problem

The MCP language_help tool always returns {"topics":[]} in the published package (@malloydata/cli 0.0.55, also on next). Every lookup fails with No topic matches '<x>'. All other MCP tools (compile, compile_file, run, run_file, prettify) work fine.

language_help()        -> {"topics":[]}
language_help("joins") -> {"error":"No topic matches 'joins'."}

Root cause

language_help loads malloy-language-reference.md via skillsDir() in src/mcp/skills.ts:

const candidates = [
  path.join(__dirname, '..', 'skills'),
  path.join(__dirname, '..', '..', 'skills'),
];

The published bundle is dist/cli.js, so at runtime __dirname is <pkg>/dist and the candidates resolve to <pkg>/skills and <pkg>/../skills — neither exists. The build actually ships the reference inside dist, at <pkg>/dist/skills/malloy-language-reference.md (confirmed in the 0.0.55 tarball). So fs.existsSync is false, the text is empty, no ## headers are parsed, and an empty topic list is cached.

Fix

Add the published location to the candidates:

const candidates = [
  path.join(__dirname, 'skills'),        // dist/skills — published layout
  path.join(__dirname, '..', 'skills'),
  path.join(__dirname, '..', '..', 'skills'),
];

Environment

@malloydata/cli 0.0.55 (also next), run as an MCP server via npx --package @malloydata/cli malloy-cli -- ... mcp.