chore(governance): add AGENTS.md + CHANGELOG baseline

AGENTS.md

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+# AGENTS.md — wave-av/examples
+
+Agent contract for this repo. Inherits the org default (<https://github.com/wave-av/.github/blob/main/AGENTS.md>) and the [repo-governance standard](https://github.com/wave-av/wave-foundation/blob/master/frameworks/repo-governance/governance-matrix.md).
+
+## Build and test
+
+See `README.md` for setup. Run the repo's lint / typecheck / test before opening a PR, and fix what you broke.
+
+## Rules
+
+- Branch and open a PR; never push to the default branch. All required gates must pass before merge.
+- No secrets in commits — secret-scan is a required gate and will block.
+- Conventional Commit titles; update `CHANGELOG.md` (`Unreleased`) for user-facing changes.
+- Match the existing code conventions; keep files focused (~200-500 lines).
+
+## Security
+
+Report vulnerabilities via the [Security Policy](https://github.com/wave-av/.github/blob/main/SECURITY.md) (security@wave.online) — never in a public issue.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project are documented here. The format is based on
+[Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to
+[Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]