narratio/docs/internal/artifacts.md

# Internal: Artifacts

## Purpose
Define canonical artifact IDs, runtime catalog behavior, source resolution rules, and shared current-state mechanics used by app and previous-cache code.

## Built-in Source IDs

- `narratio.transcript.base` -> `transcripts/base.json` (`merge`)
- `narratio.transcript.polished` -> `transcripts/polished.json` (`polish`)
- `narratio.transcript.final` -> `transcripts/final.json` (`normalize`)
- `narratio.transcript.final_trimmed` -> `transcripts/final.trimmed.json` (`trim`)
- `narratio.transcript.final_markdown` -> `transcripts/final.md` (`render`)
- `narratio.transcript.final_trimmed_markdown` -> `transcripts/final.trimmed.md` (`render`)
- `narratio.bounds.session` -> `artifacts/session_bounds.json` (`trim`)

## Configured and Previous-Session Sources

- configured source ID format: `narratio.artifact.<artifact_key>`
- previous-session source ID format: `narratio.previous_session.artifact.<artifact_key>`

Both formats are validated by strict source-policy rules.

## Runtime Catalog

`ArtifactCatalog` tracks:

- `planned`: source registered for run context;
- `executable`: selected and enabled for analyze execution;
- `available`: local file exists and validates;
- `provenance`: availability source.

Current provenance values:

- `generated.current_analyze_run`
- `filesystem.disabled_artifact_output`
- `manifest.inputs.previous_cache`
- `current_session.previous_cache`

## Resolution Rules

Built-ins:

1. manifest producer outputs (when present)
2. canonical session-path fallback

Configured sources (`narratio.artifact.*`):

- resolve only through runtime catalog availability.

Previous-session sources (`narratio.previous_session.artifact.*`):

- resolve only from local `previous/` cache state;
- prefer manifest-backed previous-input paths;
- fallback to existing previous-cache filesystem paths.

Validation by content type:

- transcript JSON built-ins: JSON with top-level `segments` array;
- transcript Markdown built-ins: non-empty text file;
- bounds built-in: valid JSON;
- configured/previous-session artifact files: non-empty text file.

## Previous Requirement Collection

`CollectPreviousArtifactRequirements`:

- scans enabled configured artifacts only;
- extracts only canonical previous-session sources;
- deduplicates by artifact key;
- merges required and optional references (required wins);
- returns deterministic ordering and source locations.

## Current-State Helpers

Artifacts package owns shared remote current-state loading mechanics used by restore, status/validate checks, and previous-cache planning.

Core helpers:

- `LoadCurrentRunPointer`
- `LoadCurrentManifest`
- `LoadCurrentState`
- `ValidateCurrentStateIdentity`

Typed missing-state errors:

- `CurrentRunPointerMissingError` (`ErrCurrentRunPointerMissing`)
- `CurrentManifestMissingError` (`ErrCurrentManifestMissing`)

Identity validation supports caller-provided expectations:

- expected campaign;
- expected session ID;
- expected run ID, or pointer/manifest run-ID consistency check.

Caller policy is intentionally outside artifacts helpers:

- some callers fail on missing current state;
- some callers downgrade missing state to status/findings;
- some callers skip optional behavior when state is missing.

## Key Path Helpers

`internal/artifacts/paths.go` and S3-key helpers define canonical helpers for:

- session/work/run paths;
- previous-cache paths;
- spool/cache paths;
- S3 session/run/current-state key layout.

## Invariants

- source ID formats are stable contracts;
- artifact resolution is deterministic and manifest-aware;
- previous-session source resolution in `analyze` is local-only;
- remote current-state key construction remains centralized in artifacts helpers.