Add package documentation comments

cache/doc.go

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+// Package cache is a memory store for key-value pairs for all loaded symbols available for output.
+package cache

dev/asm/doc.go

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+// Executable asm compiles festival assembly code to bytecode instructions.
+package main

dev/disasm/doc.go

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+// Executable disasm generates festival assembly code from bytecode instructions.
+package main

dev/gendata/doc.go

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+// Execution gendata output testdata provisions compatible with resource.FsResource to a filesystem directory.
+package main

dev/interactive/doc.go

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+// Executable interactive runs the Engine execution loop against interactive client input in the terminal.
+package main

engine/doc.go

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+// Package engine orchestrates client input with vm execution.
+package engine

persist/doc.go

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+// Package persist enables persistent storage of the execution state.
+package persist

render/doc.go

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+// Package render handles output size constraints and paginated rendering of contents and menus against templates.
+package render

resource/doc.go

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+// Package resource interfaces retrieval of bytecode, output templates and external code execution.
+package resource