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/hooks/hashline-edit-diff-enhancer/hook.ts

@@ -1,106 +0,0 @@
-import { log } from "../../shared"
-import { generateUnifiedDiff, countLineDiffs } from "../../tools/hashline-edit/diff-utils"
-
-interface HashlineEditDiffEnhancerConfig {
-	hashline_edit?: { enabled: boolean }
-}
-
-type BeforeInput = { tool: string; sessionID: string; callID: string }
-type BeforeOutput = { args: Record<string, unknown> }
-type AfterInput = { tool: string; sessionID: string; callID: string }
-type AfterOutput = { title: string; output: string; metadata: Record<string, unknown> }
-
-const STALE_TIMEOUT_MS = 5 * 60 * 1000
-
-const pendingCaptures = new Map<string, { content: string; filePath: string; storedAt: number }>()
-
-function makeKey(sessionID: string, callID: string): string {
-	return `${sessionID}:${callID}`
-}
-
-function cleanupStaleEntries(): void {
-	const now = Date.now()
-	for (const [key, entry] of pendingCaptures) {
-		if (now - entry.storedAt > STALE_TIMEOUT_MS) {
-			pendingCaptures.delete(key)
-		}
-	}
-}
-
-function isWriteTool(toolName: string): boolean {
-	return toolName.toLowerCase() === "write"
-}
-
-function extractFilePath(args: Record<string, unknown>): string | undefined {
-	const path = args.path ?? args.filePath ?? args.file_path
-	return typeof path === "string" ? path : undefined
-}
-
-async function captureOldContent(filePath: string): Promise<string> {
-	try {
-		const file = Bun.file(filePath)
-		if (await file.exists()) {
-			return await file.text()
-		}
-	} catch {
-		log("[hashline-edit-diff-enhancer] failed to read old content", { filePath })
-	}
-	return ""
-}
-
-export function createHashlineEditDiffEnhancerHook(config: HashlineEditDiffEnhancerConfig) {
-	const enabled = config.hashline_edit?.enabled ?? false
-
-	return {
-		"tool.execute.before": async (input: BeforeInput, output: BeforeOutput) => {
-			if (!enabled || !isWriteTool(input.tool)) return
-
-			const filePath = extractFilePath(output.args)
-			if (!filePath) return
-
-			cleanupStaleEntries()
-			const oldContent = await captureOldContent(filePath)
-			pendingCaptures.set(makeKey(input.sessionID, input.callID), {
-				content: oldContent,
-				filePath,
-				storedAt: Date.now(),
-			})
-		},
-
-		"tool.execute.after": async (input: AfterInput, output: AfterOutput) => {
-			if (!enabled || !isWriteTool(input.tool)) return
-
-			const key = makeKey(input.sessionID, input.callID)
-			const captured = pendingCaptures.get(key)
-			if (!captured) return
-			pendingCaptures.delete(key)
-
-			const { content: oldContent, filePath } = captured
-
-			let newContent: string
-			try {
-				newContent = await Bun.file(filePath).text()
-			} catch {
-				log("[hashline-edit-diff-enhancer] failed to read new content", { filePath })
-				return
-			}
-
-			const { additions, deletions } = countLineDiffs(oldContent, newContent)
-			const unifiedDiff = generateUnifiedDiff(oldContent, newContent, filePath)
-			
-			output.metadata.filediff = {
-				file: filePath,
-				path: filePath,
-				before: oldContent,
-				after: newContent,
-				additions,
-				deletions,
-			}
-			
-			// TUI reads metadata.diff (unified diff string), not filediff object
-			output.metadata.diff = unifiedDiff
-
-			output.title = filePath
-		},
-	}
-}