A vision thought opens a small pull to docs/VISION.md, linked under the thought, on /asked and in MCP `thought`

The first half of the owner's #655. This only proposes the edit. Landing it changes nothing else yet (that is the next issue). Pull #5761 already has this path.

Done when:

[ ] A thought that triage reads as vision opens a pull editing docs/VISION.md. The edit adds one dated line under a Changes of direction section, creating the section if it is missing. The description quotes the thought and carries its id.
[ ] The placement records the pull (placed[].pull, action proposed). That record, not the branch name, is what marks the pull as a vision pull.
[ ] The reply under the thought links the pull. /asked and MCP thought {id} link it too.
[ ] A person lands it, and merging it changes no setting.
[ ] Tests: a vision thought opens the pull, in a repository with and without docs/VISION.md, and the three links appear.

Files: src/crew/vision.ts (new), src/crew/triage.ts, src/web/studio/asked_page.ts, src/http/mcp.ts, tests.

A vision thought opens a small pull to docs/VISION.md, linked under the thought, on /asked and in MCP `thought` #5833

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