Refresh report and template internals documentation

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# Prompt Input Internals
This document describes YAML prompt data package construction in
`internal/promptinput`.
`internal/promptinput` converts report metadata, an ordered module snapshot,
Recent Changes, and source warnings into the YAML `data_package` consumed by
Scriptorium. It owns this package's schema, grouping, serialization, loading,
and validation—not weather collection, module construction, path choice, or
subprocess execution.
## Purpose
## Package construction
`internal/promptinput` converts report metadata, ordered module outputs, Recent
Changes, and source warnings into the `data_package` file passed to
Scriptorium.
`Build` produces `weatherreporter.data_package.v3`. It copies the run ID;
report ID, variant, prompt ID, generation time, timezone, local current date,
and valid period; ordered briefing stanzas; Recent Changes; and source
warnings. A nil Recent Changes slice becomes an empty `items` list.
The persisted data package is YAML with schema version
`weatherreporter.data_package.v3`. It is separate from the JSON module snapshot
used for inspection and comparison. Data packages serialize each module
output's prompt export value, not necessarily the full rich module value saved
in the module snapshot.
Briefing starts as a flat snapshot order and stanza-value map. `Build` uses
each output's `DataPackageValue`, so runtime prompt exports take precedence and
rich values are used only as a fallback. Prompt exports are selected by the
[briefing registry](briefing.md), while the rich-versus-prompt contract is in
[module internals](module.md).
## Inputs And Outputs
## YAML ordering and grouping
Inputs:
Serialization keeps `metadata` directly under `briefing`. Every other known
stanza is placed in exactly one category, emitted in category order and in its
original snapshot order within that category:
- report metadata from app/state orchestration
- `module.Snapshot`
- optional `[]changes.Change`
| Category | Current stanzas |
| --- | --- |
| `applicable_risk_products` | alert digest, SPC convective outlooks |
| `derived_summaries` | deterministic summaries, precipitation timing, outdoor windows, and planning values |
| `narrative_products` | narrative forecast, discussions, and weather story |
| `raw_data` | current conditions and hourly forecast |
Outputs:
This YAML presentation does not alter the flat snapshot model. `LoadYAML`
accepts the same category layout and reconstructs flat `Order` and `Values`,
rejecting misplaced, duplicate, unknown, or uncategorized stanzas.
- `promptinput.Package` with schema version, RunID, report metadata, named
module stanzas grouped for prompt presentation, Recent Changes, and source
warnings
- YAML bytes from `promptinput.MarshalYAML`
- YAML file written atomically by `promptinput.Save`
## Validation and persistence
The YAML shape includes:
`Validate` requires the current schema version, run and report identifiers,
prompt ID, generation timestamp, timezone, current local date, valid period,
and at least one ordered briefing stanza. It rejects duplicate stanza names,
missing values, and a missing category for every non-metadata stanza.
```yaml
schema_version: weatherreporter.data_package.v3
run_id: <run_id>
report:
id: <report_id>
prompt_id: <prompt_id>
briefing:
metadata: {}
applicable_risk_products:
alert_digest: {}
spc_convective_outlooks: {}
derived_summaries:
derived_daily_summary: {}
derived_daypart_summaries: {}
precip_timing: {}
outdoor_windows: {}
narrative_products:
narrative_forecast: {}
area_forecast_discussion: {}
spc_convective_discussion: {}
weather_story: {}
raw_data:
current_conditions: {}
hourly_forecast: {}
recent_changes:
items: []
`MarshalYAML` and `LoadYAML` validate their result. `Save` writes the serialized
YAML atomically; managed workspace paths are owned by [state internals](state.md).
Generated-text artifacts and template render contexts are later workflow
artifacts, not members of this package.
## Verification and invariants
Focused tests cover construction, curated exports, category ordering, YAML
round trips, invalid layout, validation, and atomic saves:
```sh
go test ./internal/promptinput
```
The `briefing` mapping keeps `metadata` directly under `briefing` and groups
weather module stanzas under prompt-facing categories. This grouping is a YAML
presentation concern only: module snapshots remain flat, and loaded
`promptinput.Package` values expose flat stanza names in `Briefing.Values`.
Within each category, stanza order follows the module snapshot output order.
Prompt-facing module intervals use local `period_begins` and `period_ends`
labels; canonical report metadata and source timestamps remain structured
timestamps where applicable.
## Module Export Boundary
Data packages are curated prompt inputs. They are not full template render
contexts and should not be treated as a dump of every field available to Go
templates.
When module outputs are built by `internal/briefing`, the registry attaches a
runtime prompt export value. `internal/promptinput` serializes
`output.DataPackageValue()` for each stanza. That helper prefers the runtime
prompt export and falls back to the rich `Value` when no prompt export is set,
which keeps loaded snapshots and hand-built tests usable.
Modules without custom export policy use pass-through behavior. Modules with
custom exports currently include:
- `current_conditions`: omits lower-case condition text and duplicate
wind-direction text.
- `hourly_forecast`: omits hour labels, lower-case description text, and the
template precipitation-mention helper while keeping forecast facts.
- `derived_daypart_summaries`: omits deterministic sentence-construction
helpers while keeping daypart period, condition, temperature trend,
precipitation, wind, notable-condition, hazard, and alert-relevance facts.
The rich module snapshot and generated-template render context still contain
the helper fields used by deterministic Markdown templates.
Daily Report, Today Report, Tomorrow Report, and Hourly Report module snapshots
use the same package schema and categories when converted into prompt input.
The default hourly module list places
`precip_timing` under `derived_summaries`, alert and SPC outlooks under
`applicable_risk_products`, AFD/SPC discussion/weather story under
`narrative_products`, and current/hourly data under `raw_data`. It does not
include civil-day summary stanzas. Generated-text and render context artifacts
are produced later in app orchestration and are not part of the YAML data
package.
The default Daily, Today, and Tomorrow module lists include civil-day summary
stanzas, planning stanzas, and `hourly_forecast` in the data package before
structured GeneratedText is requested from Scriptorium. Daily uses
`daily_planning`, Today uses `today_planning`, and Tomorrow uses
`tomorrow_planning`.
Current categories are:
- `applicable_risk_products`: location-applicable alerts, warnings, outlooks,
and similar risk products. Current stanzas include `alert_digest` and
`spc_convective_outlooks`.
- `derived_summaries`: deterministic summaries and calculated report facts.
- `narrative_products`: official narrative text products and forecast stories.
Current stanzas include `narrative_forecast`,
`area_forecast_discussion`, `spc_convective_discussion`, and
`weather_story`.
- `raw_data`: minimally transformed underlying weather data.
## Boundaries
- This package owns prompt package schema, YAML marshaling, YAML loading, and
validation.
- It does not collect weather data, derive forecast summaries, execute modules,
choose module prompt export shapes, find prior snapshots, compare changes,
choose artifact paths, or invoke Scriptorium.
## Config Fields Used
None directly. Config-derived values such as timezone, units, and prompt
location are already present in report metadata and module stanzas before this
package runs.
## External Adapters Used
None.
## State Or Manifest Behavior
`promptinput.Save` writes YAML atomically. Managed workspace paths are owned by
`internal/state`.
## Skip And Resume Behavior
None. Recent Changes is always present as an `items` list and may be empty.
## Failure Behavior
Validation fails before render preflight when required top-level fields are
missing or inconsistent, when the valid period is invalid, or when no module
stanzas are present. Save failures include filesystem operation and path
context.
## Tests
Inspect:
- `internal/promptinput/package_test.go`
- `internal/app/app_test.go`
## Invariants
- Scriptorium receives structured YAML through `--input data_package=<path>`.
- Module stanza order is deterministic within each prompt-facing category.
- Every non-metadata module stanza has exactly one prompt-input category.
- Data-package stanzas use curated module prompt exports when present and rich
values only as pass-through or fallback values.
- Data packages are narrower than generated-template render contexts.
- Recent Changes are provided by `internal/changes`; this package does not
infer changes from rendered report text.
The package is narrower than a template render context and never infers changes
from report prose.