Add a research-project router skill

[jerome-queck]

Context

The research-project contract exists on PR #207, but the only installed academic-os skill is /learn, whose module-code discovery and Teaching-only route intentionally do not fit Research projects. Add a separate user-invoked router that reaches a synced Research-project folder from any working directory and then defers to that project’s live controls.

This issue is implemented as a stacked change on PR #207; it must not widen or rewrite /learn.

Acceptance criteria

• A user-invoked /research-project <project identity> [-- what to work on] skill is authored at user scope in the repository, with matching Codex invocation policy.
• The skill discovers Research-project folders under both supported macOS Google Drive mount families without reading academic-os configuration or depending on the current working directory.
• Discovery resolves duplicate mount aliases as one folder and stops for no match or genuinely ambiguous matches.
• Project selection can use the supplied folder name, stable key or project title from the project Definition rather than assuming one private project.
• Every run reads the selected project’s live AGENTS.md, Project Profile and Project Definition before acting.
• The skill routes Learning, Sources, Meetings, Research, Deliverables, Tasks and Maintenance through the project’s own named documents and asks only when the requested area is genuinely ambiguous.
• The skill carries no copied research procedure, mathematical content, artifact format or private project identity; the Owner remains the mathematical and LaTeX author under project-local rules.
• The design decision and machine installation instructions explain why this is a separate user-invoked route from /learn.
• MAP and agent wayfinding name the new installed skill without changing the module Teaching route.
• Focused tests enforce invocation, config independence, privacy and route-boundary behavior.
• The complete repository check and test suite pass.
• The branch is reviewed, committed with required attribution, pushed, and an open pull request is linked to this issue; nothing is merged.