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gsxdsm 335c49748c FN-5651: add single-seam goal-context injector for system prompts

Introduce a dedicated injector seam that appends active goal context to system prompts.

- add goal-context injector module that builds deterministic system-prompt goal context from active goals
- export injector utilities through engine index for integration and reuse
- add focused tests covering formatting, filtering, ordering, and empty-context behavior

Files changed:
 .../src/__tests__/goal-context-injector.test.ts    | 188 +++++++++++++++++++++
 packages/engine/src/goal-context-injector.ts       | 142 ++++++++++++++++
 packages/engine/src/index.ts                       |   8 +
 3 files changed, 338 insertions(+)

Fusion-Task-Id: FN-5651

Fusion-Task-Lineage: 6fd3a8a0-f33a-48fd-b9f2-9a16c24c48c8

2026-05-29 07:11:00 -07:00