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gsxdsm 3d6a908b95 FN-8898: document inert prerebase settings

Clarify that legacy prerebase settings are inert on the production merge path.

- Mark retained prerebase configuration and audit events as legacy-only.
- Add a static validator and tests preventing new prerebase callers.
- Update merge architecture, testing, and settings documentation.

Files changed:
 AGENTS.md                                          |   2 +-
 docs/architecture.md                               |   3 +-
 docs/settings-reference.md                         |   6 +-
 docs/testing.md                                    |   2 +-
 package.json                                       |   6 +-
 packages/core/src/types/settings/settings-scope.ts |  32 +++--
 .../src/errors/transient-merge-error-classifier.ts |  12 +-
 packages/engine/src/merge/merger-auto-prerebase.ts |  12 +-
 packages/engine/src/util/run-audit.ts              |   2 +
 scripts/__tests__/check-prerebase-inert.test.mjs   |  73 +++++++++++
 scripts/__tests__/run-static-gate-checks.test.mjs  |   1 +
 scripts/__tests__/verify-fast.test.mjs             |   1 +
 scripts/check-prerebase-inert.mjs                  | 146 +++++++++++++++++++++
 scripts/lib/source-projection.mjs                  |  87 ++++++++++++
 14 files changed, 359 insertions(+), 26 deletions(-)

Fusion-Task-Id: FN-8898

Fusion-Task-Lineage: 9cfd836d-17c2-44a0-a076-56fef0917935

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-09 06:01:02 -07:00