Add filesystem state metadata baseline

internal/state/store.go

@@ -0,0 +1,25 @@
+// Package state persists report artifacts and metadata.
+package state
+
+import (
+	"context"
+
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/adapters/scriptorium"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/briefing"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptinput"
+	"gitea.maximumdirect.net/eric/weatherreporter/internal/report"
+)
+
+type Store interface {
+	Paths(report.Resolved) (ArtifactPaths, error)
+	SaveBriefing(context.Context, report.Resolved, briefing.Package) (string, error)
+	SaveDataPackage(context.Context, report.Resolved, promptinput.Package) (string, error)
+	SavePreflight(context.Context, report.Resolved, *scriptorium.RenderResult) (string, error)
+	SaveMetadata(context.Context, Metadata) (string, error)
+	FindPriorDailySnapshot(context.Context, report.Resolved) (*PriorSnapshot, error)
+}
+
+type PriorSnapshot struct {
+	Metadata     Metadata
+	BriefingPath string
+}