Add stewardship readiness asset: docs/MAINTENANCE.md

docs/MAINTENANCE.md

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+# Maintenance
+<!-- stewardship-standard: maintenance-v1 -->
+
+## Stewardship Rules
+
+- Keep generated files, build outputs, copied SDKs, and raw firmware binaries out of Git unless they are the source of truth.
+- Keep credentials, tokens, dumps, private messages, session stores, and local machine paths out of commits.
+- Prefer small commits with clear intent and a matching issue or release note.
+- Preserve upstream attribution when code is copied, forked, or adapted.
+
+## Routine Checks
+
+- README still describes what the project does.
+- Setup instructions still work.
+- Security policy is accurate for the current risk level.
+- Changelog records user-visible changes.
+- License status is explicit.