Namespace PR-5b: corpus import strip src/v2/workflow + src/v2/extdeps (delete import lines; bare refs stay; disjoint from 5a; regen if needed; dag_compile_clean_gate)

[briansrls]

Auto-opened by session-dashboard for session quiet-bear-77.
Pushing to session/quiet-bear-77 advances this PR.

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Summary

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Test plan

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[gunbai-bot]

Addressed the REQUEST_CHANGES scaffold finding in 991bf3852 (builds on 62892d8ac):

• CLI_RUN_NAMESPACE_IMPORT_SYNTHESIS_SCAFFOLD_MARKER (cli_run_namespace_import_synthesis) with §7 block listing delete-when scope (~430 LOC), receipt (rg cli_run_namespace_import_synthesis), and dissolve trigger ^migrate_when_namespace_only_resolution_lands tied to namespace-resolution-design.md terminal step 5.
• Planning-doc cross-reference under PR-5b import-line strip (interim host bridge) in that design note.
• Witness constant test namespace_import_synthesis_scaffold_marker_is_declared alongside the other CLI_RUN_*_SCAFFOLD_MARKER checks.

The bridge is interim hand-Rust (origin/main import replay + bare-export closure for module-graph facts / inert-lens hygiene), not token synthesis — the false-positive extdeps.diagnostic.edac { diagnostic } path was rejected in favor of main replay.

— sent from quiet-bear-77

[gunbai-bot]

Finding 1 — restore_stripped_imports_from_main fail-open (BLOCKING): valid, fixed in 00bcf6267.

git show spawn failure or non-success now returns Err with a typed located diagnostic (namespace import restore: … §5 fail-closed) instead of silently returning import-free content. Propagates through augment_sources_with_synthesized_namespace_imports → load_sources_for_entry_with_index. Witness: restore_stripped_imports_from_main_refuses_missing_origin_main_object.

Finding 2 — strip is cosmetic / spec-without-execution: partially valid framing, addressed with witnesses.

PR-5b intent is on-disk import deletion as the forward migration artifact; compile-time main replay is an interim seed-retained bridge (scaffold + namespace-resolution-design.md PR-5b section), not namespace-only resolution itself — that lands at ^migrate_when_namespace_only_resolution_lands.

Discriminating consumers (RED if restore removed while on-disk stays stripped):

• stripped_workflow_extdeps_on_disk_have_no_import_lines — asserts bash.dag / ci_floor_plan.dag have zero import lines on disk
• load_sources_restores_stripped_imports_in_memory_not_on_disk — on-disk stripped, in-memory restored
• ci_floor_plan_closure_includes_stripped_import_targets — bare-ref module-graph closure without import lines
• restore_stripped_imports_from_main_replays_bash_imports

Finding 3 — select_homonym_export_homes heuristic: valid as interim policy, not a silent arm.

This is import-scoped homonym disambiguation until containment lookup replaces it; behavior is locked by homonym_export_homes_* tests (v2.test exclusion, v2.std preference, std-layer for dag importers). Documented under CLI_RUN_NAMESPACE_IMPORT_SYNTHESIS_SCAFFOLD_MARKER; dissolves with namespace-only resolution — not a production fallback that widens on failure.

— sent from quiet-bear-77

[gunbai-bot]

Superseded by integration collapse PR #6640 (session/still-owl-689, work item adhoc-2ace4fe2-aad). Strip diff folded into single Wave-1 landing branch; individual lane PR closed per coordinator ruling.

[gunbai-bot]

Superseded by integration PR #6640 (session/still-owl-689). Strip content collapsed into atomic Wave-1 landing target; hold draft until G1+(c). — still-owl-689