fix: resolve publish blockers for v3.7.4→v3.8.0 release

- Fix #1991 crash: optional chaining for task-history sessionID access
- Fix #1992 think-mode: add antigravity entries to HIGH_VARIANT_MAP
- Fix #1949 Copilot premium misattribution: use createInternalAgentTextPart
- Fix #1982 load_skills: pass directory to discoverSkills for project-level skills
- Fix command priority: sort scopePriority before .find(), project-first return
- Fix Google provider transform: apply in userFallbackModels path
- Fix ralph-loop TUI: optional chaining for event handler
- Fix runtime-fallback: unify dual fallback engines, remove HTTP 400 from retry,
  fix pendingFallbackModel stuck state, add priority gate to skip model-fallback
  when runtime-fallback is active
- Fix Prometheus task system: exempt from todowrite/todoread deny
- Fix background_output: default full_session to true
- Remove orphan hooks: hashline-edit-diff-enhancer (redundant with hashline_edit
  built-in diff), task-reminder (dead code)
- Remove orphan config entries: 3 stale hook names from Zod schema
- Fix disabled_hooks schema: accept arbitrary strings for forward compatibility
- Register json-error-recovery hook in tool-guard pipeline
- Add disabled_hooks gating for question-label-truncator, task-resume-info,
  claude-code-hooks
- Update test expectations to match new behavior

src/tools/background-task/create-background-output.ts

@@ -78,7 +78,7 @@ export function createBackgroundOutput(manager: BackgroundOutputManager, client:
         }
 
         const isActive = task.status === "pending" || task.status === "running"
-        const fullSession = args.full_session ?? false
+        const fullSession = args.full_session ?? true
         const includeThinking = isActive || (args.include_thinking ?? false)
         const includeToolResults = isActive || (args.include_tool_results ?? false)
 

src/tools/background-task/tools.test.ts

@@ -243,8 +243,7 @@ describe("background_output full_session", () => {
     const output = await tool.execute({ task_id: "task-1" }, mockContext)
 
     // #then
-    expect(output).toContain("# Task Status")
-    expect(output).not.toContain("# Full Session Output")
+    expect(output).toContain("# Full Session Output")
   })
 
   test("returns full session when explicitly requested for running task", async () => {