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gsxdsm 4ea9d66b4f FN-6219: prefer fresh agent model settings for automatic runs

Automatic agent runs now resolve lane-specific task and settings models before falling back to durable runtime defaults.

- Prefer fresh execution, planning, heartbeat, merger, and validator model resolution over stale assigned-agent runtime config when complete settings are available.
- Centralize validator session model resolution and align mission validation with the shared helper.
- Add regression coverage for automatic run model precedence and test-mode handling.
- Add a patch changeset for the published CLI package.

Files changed:
 .changeset/fuzzy-agents-run.md                     |   5 +
 .../core/src/__tests__/model-resolution.test.ts    |  40 +++++
 .../agent-session-helpers-test-mode.test.ts        |  35 ++--
 .../src/__tests__/agent-session-helpers.test.ts    | 199 ++++++++++++++++++---
 .../src/__tests__/heartbeat-executor.test.ts       |  10 +-
 .../src/__tests__/mission-execution-loop.test.ts   |   6 +-
 packages/engine/src/__tests__/triage.test.ts       |   4 +-
 packages/engine/src/agent-session-helpers.ts       | 111 +++++++-----
 packages/engine/src/mission-execution-loop.ts      |  33 +---
 packages/engine/src/triage.ts                      |   6 +-
 10 files changed, 326 insertions(+), 123 deletions(-)

Fusion-Task-Id: FN-6219
Fusion-Task-Lineage: c3ef6d91-234f-4ed1-97c7-9be8408cd86c

2026-06-11 09:21:23 -07:00