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gsxdsm fc2040ca84 FN-8821: retire ephemeral-agent routing branches

Keep the legacy ephemeral-agent setting compatible while making all workflow routing durable-principal-only.

- Preserve and expose the legacy setting as a routing-inert compatibility field.
- Remove scheduler, executor, and mission-start branches that honored the deprecated toggle.
- Add coverage for settings persistence and durable routing invariants.

Files changed:
 .changeset/fn-8821-retire-ephemeral-routing.md     |   7 +
 docs/settings-reference.md                         |   4 +-
 .../core/src/__tests__/settings-parity.test.ts     |   8 +-
 packages/core/src/config/settings-schema.ts        |  11 +-
 packages/core/src/task-store/settings-helpers.ts   |  15 +-
 packages/core/src/task-store/settings-ops.ts       |  12 +-
 packages/core/src/types/settings/settings-scope.ts |   5 +-
 .../__tests__/SettingsModal.general.test.tsx       |  23 ++
 .../settings/sections/GeneralSection.tsx           |  13 ++
 .../src/__tests__/mission-start-routing.test.ts    | 104 +++++++++
 ...ecutor-ephemeral-disabled-dispatch-gate.test.ts | 243 +++++++++++++++++++++
 .../__tests__/scheduler-ephemeral-toggle.test.ts   | 125 +++++++++++
 12 files changed, 542 insertions(+), 28 deletions(-)

Fusion-Task-Id: FN-8821

Fusion-Task-Lineage: e81ec9c0-f2b0-48f9-ae2b-9bbde4491447

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

2026-08-07 02:33:35 -07:00