prosa-importer-sessionlisted

# Prosa Importer Session Use this skill before changing an importer or the canonical `session.Session` mapping. ## Canonical contract `docs/architecture/canonical-session.md` is authoritative. Every importer must map its source JSONL into `pkg/session.Session` with stable metadata, normalized turns, tool calls, timestamps, project context, and raw preservation. The importer interface lives in `pkg/importer`: - `Name()` returns the stable agent key (`claude-code`, `codex`, `cursor`, `gemini`). - `DefaultRoots()` returns source directories to scan. - `Walk(ctx, root)` discovers source files without importing them. - `Import(ctx, path, sink)` parses one source file and writes through the `Sink` abstraction (defined in `pkg/importer/importer.go`). The plugin interface is documented end-to-end in `docs/architecture/importers.md`. ## Source references Read the relevant source-format doc before editing parser behavior: - `docs/sources/claude-code.md` for Claude Code JSONL. - `docs/sources/codex.md` for Codex session JSONL. - `docs/sources/README.md` for the structure every per-agent doc must follow. Use an analogous importer as the default shape for new agents — see `internal/importers/claudecode/` for a complete model. ## Raw preservation The local store keeps one raw `.jsonl` per session under the prosa data dir (`paths.RawRoot(agent)/<YYYY>/<MM>/<session-id>.jsonl`). Do not rely on the original agent file remaining on disk. Importers preserve the original bytes