tdtCtc110m failed to download ctcHeadModel in `parakeet-ctc-110m`

[Josscii]

Although the code says it is a beta feature, but when AsrManager try to load models for tdtCtc110m, it will always try to download ctcHeadModel from parakeet-ctc-110m hf repo, and the DownloadUtils has bug downloading specific model in some repo, it will download all the requiredModels of the model, not the modelnames it passed in.

FluidAudio/Sources/FluidAudio/ASR/Parakeet/SlidingWindow/TDT/AsrModels.swift

Lines 270 to 308 in 4ef33f0

	// [Beta] Optionally load CTC head model for custom vocabulary.
	// Supports two paths:
	// v1: CtcHead.mlmodelc placed manually in the TDT model directory
	// v2: Auto-download from FluidInference/parakeet-ctc-110m-coreml HF repo
	var ctcHeadModel: MLModel?
	if version == .tdtCtc110m {
	// v1: Check local TDT model directory first
	let repoDir = repoPath(from: directory, version: version)
	let ctcHeadPath = repoDir.appendingPathComponent(Names.ctcHeadFile)
	if FileManager.default.fileExists(atPath: ctcHeadPath.path) {
	let ctcConfig = MLModelConfiguration()
	ctcConfig.computeUnits = config.computeUnits
	ctcHeadModel = try? MLModel(contentsOf: ctcHeadPath, configuration: ctcConfig)
	if ctcHeadModel != nil {
	logger.info("[Beta] Loaded CTC head model from local directory")
	} else {
	logger.warning("CTC head model found but failed to load: \(ctcHeadPath.path)")
	}
	}
	// v2: Fall back to downloading from parakeet-ctc-110m HF repo
	if ctcHeadModel == nil {
	do {
	let ctcModels = try await DownloadUtils.loadModels(
	.parakeetCtc110m,
	modelNames: [Names.ctcHeadFile],
	directory: parentDirectory,
	computeUnits: config.computeUnits,
	progressHandler: progressHandler
	)
	ctcHeadModel = ctcModels[Names.ctcHeadFile]
	if ctcHeadModel != nil {
	logger.info("[Beta] Loaded CTC head model from HF repo")
	}
	} catch {
	logger.warning("CTC head model not available: \(error.localizedDescription)")
	}
	}
	}

FluidAudio/Sources/FluidAudio/DownloadUtils.swift

Lines 205 to 210 in 4ef33f0

	let repoPath = directory.appendingPathComponent(repo.folderName)
	let requiredModels = ModelNames.getRequiredModelNames(for: repo, variant: variant)
	let allModelsExist = requiredModels.allSatisfy { model in
	let modelPath = repoPath.appendingPathComponent(model)
	return FileManager.default.fileExists(atPath: modelPath.path)
	}

I believe this is not the desired hehavior.