Adopt shared policies and align ReleaseKit documentation and licensing

docs/development.md

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+# Developing ReleaseKit
+
+ReleaseKit currently contains adopted policies and design documents. See the
+[README](../README.md) for orientation and the [product roadmap](roadmap/releasekit.md)
+for proposed capabilities and implementation sequencing.
+
+Read the [agent policy](policy/agents.md) and inspect the worktree before editing.
+Preserve unrelated changes and follow explicit instructions about commits.
+The [architecture policy](policy/architecture.md) governs development boundaries;
+[ADR 0001](adr/0001-public-facade.md) records the facade decision. The
+[documentation policy](policy/documentation.md#canonical-ownership) owns the
+documentation topic map.
+
+## Policy Reading Guide
+
+| Policy | Read before… |
+| --- | --- |
+| [Policy set provenance](policy/meta.md) | Adopting policies, checking upstream revisions, or updating the adopted policy set. |
+| [Agents](policy/agents.md) | Recommending, planning, or implementing repository changes. |
+| [Architecture](policy/architecture.md) | Planning or changing library or executable code or its structure. |
+| [Testing](policy/testing.md) | Selecting validation for code changes, or adding, changing, removing, or evaluating tests. |
+| [Documentation](policy/documentation.md) | Writing, revising, or reorganizing documentation. |
+| [OSS](policy/oss.md) | Adding or updating dependencies or incorporated third-party material, or changing licensing or attribution. |
+| [Release](policy/release.md) | Preparing or publishing a release, changing release procedures, or making versioning and compatibility decisions. |
+
+- Read applicable policies before making decisions they govern; multiple policies
+  may apply.
+- Select policies using the task triggers above. Follow cross-references to
+  relevant sections when needed to resolve a concrete question.
+- Reuse policies already available in context; reread when changed or no longer
+  available.
+- Expand reading when the task's scope expands.
+- When revising a policy itself, read that policy and any provisions elsewhere
+  affected by the revision.
+
+## Validation
+
+For prose changes, review the diff and check local links, fragment destinations,
+provenance, template residue, and consistency with current repository contents.
+Check prose whitespace with:
+
+```sh
+git diff --check -- '*.md' COPYRIGHT
+git diff --cached --check -- '*.md' COPYRIGHT
+```
+
+Verbatim license texts retain their supplied formatting. When changing those
+texts, compare their bytes with the selected upstream source.
+
+There is no `go.mod`, default test suite, or publication command yet. Add working
+development commands here as implementation lands. Add `docs/release.md` with
+the first working publication command; the [policy adoption roadmap](roadmap/policy.md#4-define-releasekits-own-release-path)
+records the remaining bootstrap work.