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weatherreporter/docs/internal/prepared-report.md

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# Prepared Report Internals
`internal/app` builds a `preparedReport` after collection and before profile
execution. This is the immutable boundary shared by ordinary report generation
and profile comparison; it is not a durable artifact.
Preparation builds report facts, the configured module snapshot, briefing
metadata, the curated prompt-input package, serialized YAML, and the
generated-text definition. It deep-copies mutable facts, snapshots, metadata,
and data-package bytes before returning them. Consumers receive independent
copies so one execution cannot change another's input or rendering context.
Single-report generation executes one prepared profile and publishes its
Markdown. Comparison prepares once, gives every selected profile the same YAML
bytes, and only then assembles the resulting logical bundle. The prompt-input
shape is owned by [prompt-input internals](prompt-input.md); profile execution
semantics are owned by [Promptkit integration](../integrations/promptkit.md).
Preparation failure has no publication side effects. Tests for this boundary
cover mutation isolation, byte equality, and reuse by both execution paths.