feat(FN-2992): merge fusion/fn-2992

Commits merged:
- fix(FN-2992): align ResearchView styles with design tokens
- fix(FN-2992): align Research view with standalone layout conventions
- test(FN-2992): complete Step 6 — expand orchestration verification
- feat(FN-2992): complete Step 5 — wire research settings and engine exports
- test(FN-2992): cover provider error classification in step runner
- feat(FN-2992): complete Step 4 — implement research step runner
- test(FN-2992): add orchestrator lifecycle regression coverage
- feat(FN-2992): complete Step 3 — add research orchestrator lifecycle
- feat(FN-2992): complete Step 2 — align research store API events
- feat(FN-2992): complete Step 1 — define orchestration domain types
- feat(FN-2992): complete Step 1 — define orchestration domain types

Files changed:
packages/core/src/index.ts                         |  15 +
 packages/core/src/research-store.ts                |   8 +-
 packages/core/src/research-types.ts                | 109 +++++
 packages/core/src/settings-schema.ts               |  10 +
 packages/core/src/types.ts                         |  31 ++
 packages/dashboard/app/components/ResearchView.css |  87 +++-
 packages/dashboard/app/components/ResearchView.tsx | 144 +++---
 .../app/components/__tests__/ResearchView.test.tsx |   3 +-
 .../src/__tests__/research-orchestrator.test.ts    | 256 ++++++++++
 .../src/__tests__/research-step-runner.test.ts     | 102 ++++
 packages/engine/src/index.ts                       |  11 +
 packages/engine/src/project-engine.ts              |  17 +
 packages/engine/src/research-orchestrator.ts       | 517 +++++++++++++++++++++
 packages/engine/src/research-step-runner.ts        | 235 ++++++++++
 14 files changed, 1464 insertions(+), 81 deletions(-)

Fusion-Task-Id: FN-2992

packages/core/src/settings-schema.ts

@@ -64,6 +64,11 @@ export const DEFAULT_GLOBAL_SETTINGS = {
   // Dashboard TUI memory guard
   vitestAutoKillEnabled: true,
   vitestKillThresholdPct: 90,
+  researchGlobalEnabled: true,
+  researchGlobalMaxConcurrentRuns: 3,
+  researchGlobalDefaultTimeout: 300000,
+  researchGlobalMaxSourcesPerRun: 20,
+  researchGlobalMaxSynthesisRounds: 2,
 } satisfies CompleteSettings<GlobalSettings>;
 
 /** Default values for project-level settings. */
@@ -212,6 +217,11 @@ export const DEFAULT_PROJECT_SETTINGS = {
   reflectionAfterTask: true,
   reviewHandoffPolicy: "disabled",
   showQuickChatFAB: false,
+  researchEnabled: true,
+  researchMaxConcurrentRuns: 3,
+  researchDefaultTimeout: 300000,
+  researchMaxSourcesPerRun: 20,
+  researchMaxSynthesisRounds: 2,
   experimentalFeatures: {},
 } satisfies CompleteSettings<ProjectSettings>;