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gsxdsm ee0b1cd9c8 FN-5658: add goal injection visibility diagnostics

Improve anchoring visibility by classifying and emitting goal-injection diagnostics across engine lanes.

- add goal-injection diagnostics module with result/failure classification and audit emission helpers
- wire heartbeat and executor prompt construction to resolve classified goal context and emit diagnostic events
- expose diagnostic APIs from engine index and add new run-audit event type for prompt goal injection
- add unit and wiring tests plus diagnostics docs updates for the new observability path

Files changed:
 docs/diagnostics.md                                |   8 +
 .../goal-injection-diagnostics-wiring.test.ts      |  87 +++++++++
 .../__tests__/goal-injection-diagnostics.test.ts   | 150 +++++++++++++++
 packages/engine/src/agent-heartbeat.ts             |  34 +++-
 packages/engine/src/executor.ts                    |  35 +++-
 packages/engine/src/goal-injection-diagnostics.ts  | 209 +++++++++++++++++++++
 packages/engine/src/index.ts                       |  10 +
 packages/engine/src/run-audit.ts                   |   7 +-
 8 files changed, 521 insertions(+), 19 deletions(-)

Fusion-Task-Id: FN-5658

Fusion-Task-Lineage: f4feaa37-d9b1-4bb6-b8c9-35a9b7a02f57

2026-05-29 20:50:08 -07:00