Update documentation and testing policies and add a migration plan to cleanly separate the scriptorium CLI from the promptkit internals

docs/development.md

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+# Development
+
+This is the contributor entry point for Scriptorium. Use the task-specific
+reading guide below before making changes. Canonical architecture, contracts,
+component behavior, and policies remain in their owning documents.
+
+## Initial Orientation
+
+Before starting work:
+
+1. inspect the working tree and preserve unrelated changes;
+2. read the architecture policy for code or design work;
+3. read the policy, contract, and internal documents listed for the task;
+4. inspect the relevant implementation and tests before deciding how to change
+   them.
+
+Start with:
+
+- [Architecture policy](policy/architecture.md) for system boundaries,
+  invariants, and non-goals;
+- [Documentation policy](policy/documentation.md) before changing
+  documentation;
+- [Testing policy](policy/testing.md) before adding, rewriting, or deleting
+  tests.
+
+## Task-Specific Reading Guide
+
+| Task | Read before changing |
+| --- | --- |
+| Public Go package or engine behavior | [Go package consumer contract](consumers/pkg-scriptorium.md), [runner internals](internal/runner.md), [adapter internals](internal/adapters.md), and [source internals](internal/sources.md) |
+| CLI commands, flags, output, or exit behavior | [CLI contract](cli.md) and [adapter internals](internal/adapters.md) |
+| HTTP routes, DTOs, limits, or status mapping | [HTTP API contract](api.md), [adapter internals](internal/adapters.md), and [source internals](internal/sources.md) |
+| Application configuration | [Configuration contract](config.md), [adapter internals](internal/adapters.md), and [source internals](internal/sources.md) |
+| Prompt, profile, schema, or artifact loading | [Configuration contract](config.md) and [source internals](internal/sources.md) |
+| Runner orchestration, rendering, validation, or repair | [Runner internals](internal/runner.md) and [source internals](internal/sources.md) |
+| OpenAI-compatible request or response behavior | [OpenAI-compatible integration](integrations/openai-compatible-chat.md), [runner internals](internal/runner.md), and [adapter internals](internal/adapters.md) |
+| Subprocess behavior | [Subprocess integration](integrations/subprocess.md) and [CLI contract](cli.md) |
+| Runtime operation, recovery, or troubleshooting | [Operations](operations.md) and [troubleshooting](troubleshooting.md) |
+| Examples or copyable assets | The owning contract for the demonstrated behavior and the related files under `examples/` |
+| Architecture decisions or future work | The [documentation policy](policy/documentation.md), relevant accepted ADRs under `adr/`, and relevant roadmap documents under `roadmap/` |
+
+For cross-cutting changes, follow every applicable row. Internal component
+documents own detailed subsystem change recipes.
+
+## Baseline Validation
+
+Use focused checks while iterating, then run validation proportionate to the
+change and the risks described by the testing policy.
+
+The repository-level baseline for code changes is:
+
+```bash
+go test ./...
+go vet ./...
+go build ./cmd/scriptorium
+```
+
+Documentation-only work does not require the full Go suite unless it changes
+commands, examples, generated output, or another behavior that the suite
+validates. Always check changed links, paths, examples, and canonical ownership.