Add Daily prompt input preflight

docs/internal/scriptorium-adapter.md

@@ -0,0 +1,63 @@
+# Scriptorium Adapter Internals
+
+This document describes the implemented `scriptorium` subprocess adapter.
+
+## Purpose
+
+`internal/adapters/scriptorium` runs `scriptorium render` to preflight prompt
+wiring without LLM generation.
+
+## Inputs and Outputs
+
+Input:
+
+- prompt ID
+- prompt input data package path
+- configured binary, config path, profile, timeout, and extra arguments
+
+Output:
+
+- captured stdout
+- captured stderr
+- exit code
+- full argv used for inspection
+
+## Boundaries
+
+- This adapter owns `scriptorium` CLI flag construction and subprocess
+  execution.
+- It does not choose report types, build prompt input, fetch weather data, or
+  decide workflow order.
+
+## Behavior
+
+The render invocation shape is:
+
+```text
+scriptorium render --prompt <prompt_id> --input data_package=<path> --format json
+```
+
+Configured `--config` and `--profile` values are added when present. Arguments
+are passed directly as argv, not through a shell. Stdout and stderr are captured
+separately. `SaveRenderResult` writes the captured result as JSON for inspection.
+
+## Failure Behavior
+
+Nonzero render exits return both the captured result and an error containing
+the exit code and stderr. Command execution respects context cancellation and
+the configured timeout.
+
+## Tests
+
+Inspect:
+
+- `internal/adapters/scriptorium/runner_test.go`
+- `internal/app/app_test.go`
+- `internal/cli/root_test.go`
+
+## Invariants
+
+- `scriptorium` details stay inside the adapter package.
+- The input name for prompt packages is always `data_package`.
+- Render preflight is orchestration behavior; final report generation is not
+  implemented in this adapter yet.