MCP `vision`: docs/VISION.md's order of work and the repository's current direction, in one answer #5836

An agent steering a forge should read what it is for the way the crew does.

Done when:

• [ ] MCP vision {repo} answers { purpose, order: [{ n, name, text }], rules: [..], direction, updatedAt }. The first three are parsed from docs/VISION.md on the default branch. direction is the repository's autonomy direction, given only to someone who may read its settings, and null for everyone else.
• [ ] A repository without the document answers purpose: null, order: [] and no error.
• [ ] It is described in docs/MCP.md and listed in tools/list.
• [ ] Tests cover this repository's VISION.md, a repository without it, and a reader who may not see the direction.