# Stage: analyze

## Purpose
Execute selected configured Scriptorium artifacts in deterministic dependency order and promote successful outputs to canonical session artifact paths.

## Inputs and Outputs
Inputs:
- configured artifact definitions from `pipeline.scriptorium.artifacts`
- selected artifact filter from runtime (`--artifacts`) when provided
- resolved artifact input sources declared per artifact (`inputs.*.source`)
- optional previous-session file inputs (`previous_session_artifact`)

Outputs:
- one promoted output file per executed configured artifact at that artifact's configured `output_path`
- stage metadata containing generated artifact entries and reused disabled-artifact entries

## Boundaries
Owns:
- runtime artifact catalog construction for analyze execution
- selected-artifact planning and dependency ordering
- per-artifact input resolution, var resolution, timeout/render-debug resolution
- Scriptorium run/render invocation for each selected artifact
- run-local output generation and canonical promotion

Does not own:
- transcript generation/processing stages
- archive promotion policy
- per-artifact resume semantics

## Config Fields Used
- `session.session_id`
- `session.campaign`
- `pipeline.workspace.root`
- `pipeline.scriptorium.binary`
- `pipeline.scriptorium.config_path`
- `pipeline.scriptorium.timeout`
- `pipeline.scriptorium.render_debug`
- `pipeline.scriptorium.artifacts.<name>.*`
  - `enabled`
  - `depends_on`
  - `prompt_id`
  - `profile_id`
  - `timeout`
  - `output_path`
  - `render_debug`
  - `inputs`
  - `vars`

## External Adapters Used
- Scriptorium adapter:
  - optional `RenderArtifact` (render debug)
  - `RunArtifact` (artifact generation)

## State and Manifest Behavior
- If `pipeline.scriptorium` is absent, stage returns success metadata with `skipped=true`.
- If no artifacts are configured, stage returns success metadata with `skipped=true`.
- If zero artifacts are executable after `enabled` + `--artifacts` filtering, stage returns success metadata with `skipped=true`.
- Builds runtime catalog with built-ins and configured artifacts.
- Non-executable configured artifacts are marked available only when their configured output file exists and is valid on disk.
- Executes selected configured artifacts in topological order with deterministic tie-breaking.
- For each generated artifact, records metadata fields including `name`, `source_id`, `output_kind`, `path`, `prompt_id`, `profile_id`, and `provenance`.
- Reused disabled artifacts are recorded separately in `reused_artifacts` with provenance `filesystem.disabled_artifact_output`.

## Skip and Resume Behavior
- Runner-level skip applies when analyze is already `succeeded` and `--force` is not set.
- Analyze remains stage-scoped for resume/skip; there is no per-artifact resume state.
- `--artifacts` filters which configured artifacts are executable when analyze runs; it does not imply `--force`.

## Failure Behavior
- Fails on invalid dependency ordering, unavailable required configured inputs, invalid built-in input prerequisites, render/run adapter failures, validation-failed adapter results, or missing/empty outputs.
- Required configured dependency missing from catalog availability fails clearly before invocation.
- Optional missing inputs are omitted.

## Tests to Inspect Before Changing
- `internal/stage/analyze_test.go`
- `internal/artifacts/catalog_test.go`
- `internal/artifacts/artifact_resolver_test.go`
- `internal/adapters/scriptorium/subprocess_test.go`

## Architectural Invariants
- Configured artifacts are identified by `narratio.artifact.<name>` source IDs.
- Artifact-to-artifact references rely on explicit `depends_on` declarations validated in config.
- Generated analyze outputs are treated uniformly as Scriptorium artifacts.
- Successful outputs must exist and be non-empty before promotion.