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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 first establishes one `PreparedIdentity` for the report run, report
and prompt IDs, variant, generation time, units, timezone, valid period,
location, and source warnings. It passes that identity to the configured module
snapshot, curated prompt-input package, serialized YAML, generated-text render
context, and generated-text definition. Each boundary projects only the fields
it needs from that prepared authority.
Preparation deep-copies mutable facts, snapshots, identity, 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.