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FN-5653: inject active goal context into heartbeat and executor prompts

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Align heartbeat and executor prompt assembly so both lanes receive the same active-goal context block.

- inject goalContext into heartbeat and executor buildPromptLayers inputs using buildGoalContextSection
- extend goal-context regression coverage with parity tests for heartbeat/executor injection and empty-goal behavior
- update executor test helpers for goal-store access and document the shared prompt-lane behavior in architecture/agents docs

Files changed:
 docs/agents.md                                     |  1 +
 docs/architecture.md                               |  1 +
 packages/engine/src/__tests__/executor-test-helpers.ts  |  3 +
 packages/engine/src/__tests__/goal-context-injection.test.ts   | 72 ++++++++++++++++++++++
 packages/engine/src/agent-heartbeat.ts             | 12 +++-
 packages/engine/src/executor.ts                    | 12 +++-
 packages/engine/src/prompt-layers.ts               |  9 ++-
 7 files changed, 107 insertions(+), 3 deletions(-)

Fusion-Task-Id: FN-5653
Fusion-Task-Lineage: d2670585-57f7-409d-bb11-cef3448267a6
This commit is contained in:
gsxdsm
2026-05-29 18:43:51 -07:00
parent a9d2064f66
commit ff575f8b06
7 changed files with 107 additions and 3 deletions
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docs/agents.md
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@@ -279,6 +279,7 @@ Heartbeat sessions for durable agents resolve models with heartbeat-specific fal
When the runtime model is present and differs from execution-lane settings, heartbeat passes the execution-lane model as a fallback pair for session creation.
Task-scoped heartbeat runs for durable agents execute inside the task's git worktree (same as ephemeral task execution), while no-task heartbeat runs continue to execute from the project root.
Heartbeat and executor system prompts share the same active-goal context injector (`buildGoalContextSection`), so both lanes receive identical goal preambles when active goals exist.
If a heartbeat cannot create/run a session due to unavailable provider credentials or missing provider registration, Fusion records `resultJson.reason = "heartbeat_model_unavailable"` with actionable diagnostics in `resultJson.detail`/`stderrExcerpt`.