Requirements

Mount external source trees for IDE consumption		status: valid security: NO safety: QM
rationale: Out-of-tree documentation must reach the rendered site without copying, and IDE tooling must read the same project configuration Sphinx reads so editing inside a mounted bundle gets as-you-type validation without invoking Sphinx. reqtype: Functional satisfied by: tool_req__docs_mount_traceability
As a stakeholder of S-CORE docs-as-code, I want the docs() Bazel macro to expose mounted external source bundles via a declarative [[mounts]] block in the generated ubproject.toml, so that IDE extensions can resolve documents inside those bundles without invoking Sphinx.
stkh_req__docs__mounts		Stakeholder Requirement