feat: scaffold Go-based hf CLI

internal/client/doc.go

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+package client
+
+// Package client will host HarborForge HTTP client helpers.

internal/commands/doc.go

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+package commands
+
+// Package commands will define the hf command tree.

internal/config/doc.go

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+package config
+
+// Package config will resolve and manage .hf-config.json.

internal/help/doc.go

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+package help
+
+// Package help will render help and help-brief output.

internal/mode/doc.go

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+package mode
+
+// Package mode will detect padded-cell/manual runtime behavior.

internal/passmgr/doc.go

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+package passmgr
+
+// Package passmgr will integrate with pass_mgr when available.