TS/JS: workspace siblings importing each other by package name are not resolved (follow-on to #3789)

[squid-protocol]

Problem

In a monorepo, import {x} from "@scope/other" where @scope/other is a sibling workspace package (package.json workspaces) is not resolved to that package's files. #3789 covers a package importing itself by name; the sibling case is the same mechanism across packages. No workspace handling exists in gitgalaxy/core on origin/main (grep).

Evidence

Found during #3789 work.

Acceptance criteria

• Workspace package names map to their roots (package.json name + main/exports)
• Sibling imports produce import edges
• Fixture with two workspace packages

Out of scope

Self-reference (#3789); non-JS workspaces.

Found during: follow-on to #3789

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