Namespace PR-5a: corpus import strip src/v2/compiler + src/v2/std (delete import lines; bare refs stay; NamespaceOnlyY + global_bare; EXCLUDE calm-otter quartet: 03_body_producer, 05_eval, body_lowering_fold, 03_resolve; regen if needed; dag_compile_clean_gate)

[briansrls]

Auto-opened by session-dashboard for session bright-wren-211.
Pushing to session/bright-wren-211 advances this PR.

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• Title describes the change (not the session id or branch).
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[gunbai-bot]

Closing duplicate stand-down branch (bright-wren-211). Canonical Namespace PR-5a is #6603 on session/zesty-swift-860 per coordinator dispatch.