# Internal: Artifacts

## Purpose
Define Narratio's artifact identity and resolution model for built-in transcript/bounds artifacts and runtime-configured analyze artifacts.

## Inputs and outputs
Inputs:
- artifact sources from config/runtime (`pipeline.scriptorium.artifacts.*.inputs.*.source`)
- session paths and optional session manifest stage outputs
- runtime artifact catalog state for configured artifact sources

Outputs:
- resolved local artifact path and provenance (`ResolvedSessionArtifact`)
- runtime catalog entries for planned/executable/available artifacts
- validation errors for unsupported, missing, or invalid artifact sources

## Boundaries
Owns:
- built-in artifact registry and content validation rules
- runtime artifact catalog for configured artifact source IDs
- source resolution behavior for built-in and configured artifact sources

Does not own:
- artifact generation (stages produce files)
- manifest transition policy
- archive promotion behavior

## Config fields used
- `pipeline.scriptorium.artifacts.<name>.enabled`
- `pipeline.scriptorium.artifacts.<name>.output_path`
- `pipeline.scriptorium.artifacts.<name>.inputs.<key>.source`

## External adapters used
- none

## State and manifest behavior
Built-in registry entries:

| Artifact ID | Canonical file | Producer stage | Output kind |
| --- | --- | --- | --- |
| `narratio.transcript.merged` | `transcripts/merged.json` | `merge` | `transcript_merged` |
| `narratio.transcript.polished` | `transcripts/processed.json` | `polish` | `transcript_processed` |
| `narratio.transcript.full` | `transcripts/normalized.json` | `normalize` | `transcript_normalized` |
| `narratio.transcript.trimmed` | `transcripts/trimmed.json` | `trim` | `transcript_trimmed` |
| `narratio.bounds.session` | `artifacts/session_bounds.json` | `trim` | `session_bounds` |

Runtime catalog entries include built-ins and configured `narratio.artifact.<name>` sources.

Catalog states:
- `planned`: source is registered and known for this run
- `executable`: configured artifact is selected for analyze execution
- `available`: artifact has a usable file path (generated this run or reused from disk)

Resolution behavior:
- built-in sources resolve via manifest producer outputs first, then canonical fallback path
- configured `narratio.artifact.<name>` sources resolve through runtime catalog availability
- configured source lookup requires catalog context

Configured artifact provenance values:
- `generated.current_analyze_run`
- `filesystem.disabled_artifact_output`

Content validation:
- transcript built-ins: JSON with top-level `segments` array
- bounds built-in: valid JSON
- configured artifacts: non-empty text file

## Skip and resume behavior
- resolver and catalog have no direct skip/resume decisions
- stage/runner skip-resume behavior consumes catalog/resolver results

## Failure behavior
- unsupported source -> source validation error
- known source unavailable -> `ErrSessionArtifactNotFound`
- configured source without catalog -> resolution error
- resolved file with invalid content -> validation error

## Tests to inspect before changing
- `internal/artifacts/artifact_resolver_test.go`
- `internal/artifacts/catalog_test.go`
- `internal/stage/analyze_test.go`
- `internal/config/scriptorium_test.go`

## Architectural invariants
- built-in IDs are static and registry-backed
- configured artifact IDs are runtime-derived (`narratio.artifact.<name>`) and catalog-backed
- built-in/source resolution remains deterministic and validation-gated