Per the maintenance rules, a change to the dependency layout has to land in the
docs with it. Adds the placement rule in three places, at three altitudes:
- README (Setup): the rule plus the concrete drift it prevents.
- AGENTS.md: a "Dependency placement" section — the MCP SDK packages are root
only, the v1 SDK is not ours and must not become a dependency, and anything
reached solely through root-owned code with no manifest (`test-servers/src`,
`core/`) is a root devDependency aliased to the repo root in
`vitest.shared.mts`.
- .github/copilot-instructions.md: the distilled, reviewer-citable form, so a
diff re-adding one of these to a client manifest is flagged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HDdo1rNRVQnVRRdsqSrvG3
e132d551e6