iso-harness 0.2.0, agentmd 0.3.0, monorepo adopts changesets

iso-harness 0.2.0:
- New `validate` subcommand: schema-checks the iso/ source without writing
  anything. Exit 1 on errors, 0 on warnings/clean.
- `build` now calls the validator first and refuses to fan out to the
  four target harnesses if mcp.json, config.json, or any agent/command
  frontmatter has schema errors (missing `command`, non-string env
  values, duplicate agent names, unknown-harness override keys, model
  that isn't a string, etc.). Warnings (empty description, empty body)
  are surfaced in the build summary but do not block.
- 18 unit tests (was: 1 smoke-build script).

agentmd 0.3.0:
- New `--format sarif` on `lint` so findings upload to GitHub code
  scanning with the same dialect isolint emits. Driver name `agentmd`,
  rule IDs are the L-codes.

Monorepo:
- Adopt Changesets for version bumps + CHANGELOG generation. Existing
  tag-triggered release workflows still drive the npm publish; engineers
  add a changeset per PR, then `npm run version` bumps + commits +
  writes CHANGELOG.md, and a tag cut triggers the existing publish flow.
- Root scripts: `changeset`, `changeset:status`, `version`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: CharlieGreenman

.changeset/README.md

@@ -0,0 +1,8 @@
+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets).
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/main/docs/common-questions.md).

.changeset/config.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://unpkg.com/@changesets/config@3.1.4/schema.json",
+  "changelog": "@changesets/cli/changelog",
+  "commit": false,
+  "fixed": [],
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

README.md

@@ -87,6 +87,31 @@ npm run build --workspace @razroo/isolint
 npm run test  --workspace @razroo/agentmd
 ```
 
+## Releasing
+
+Version bumps are driven by [Changesets](https://github.com/changesets/changesets).
+Every PR that changes a package should include a changeset describing the
+user-visible impact:
+
+```bash
+npm run changeset          # interactive — pick packages + bump level + summary
+npm run changeset:status   # preview what the next `version` would do
+```
+
+When you're ready to cut a release:
+
+```bash
+npm run version            # bumps package versions + writes CHANGELOG.md
+git commit -am "Version packages"
+git tag <pkg>-v<version>   # e.g. agentmd-v0.3.0
+git push && git push --tags
+gh release create <pkg>-v<version> --generate-notes
+```
+
+The tag-triggered release workflows in `.github/workflows/*-release.yml`
+take over from there — verify the tag matches `package.json`, run tests,
+build, and `npm publish --provenance`.
+
 ## End-to-end example
 
 [`examples/pipeline/`](./examples/pipeline) is an executable demonstration