Land the tools-architecture restructure (PR #55)

[kgdunn]

Migrated from TODO.md (External / downstream coordination section).

Land the unmerged tools-architecture restructure: PR #55 is still open. (#55)

[kgdunn]

Triaged during the issue-triage pass (#234).

This is a project-management tracker for landing PR #55 (the tools-architecture restructure). It needs that PR to be reviewed and merged; it cannot be resolved from a separate code PR. Leaving open until PR #55 is decided.

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