Fix rewatch transitive local workspace detection

[fhammerschmidt]

Summary

Fix rewatch's local workspace detection for monorepo roots so transitive workspace dependencies are treated as local packages.

Previously, when building from a monorepo root, rewatch only marked dependencies as local if their package names appeared directly in the root rescript.json dependencies or dev-dependencies. This missed local workspace packages that were only reached transitively, even though they resolve to paths inside the workspace.

The new logic classifies monorepo-root dependencies by their resolved canonical path, matching the existing monorepo-package behavior: packages inside the workspace root and outside node_modules are local.

Why

This affects root-level monorepo builds and analysis workflows. Transitive local workspaces should be:

• watched by rewatch
• built with local package warning/dev-source behavior
• included in the root .sourcedirs.json cmt_scan plan consumed by reanalyze

Without this, root-level rescript-tools reanalyze can miss CMT files for transitive local workspaces in monorepos.

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rescript

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@rescript/darwin-arm64

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commit: 033cb5c