docs: add AGENTS.md with task-oriented docs and Flutter versions page intent

AGENTS.md

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+# Working on the Shorebird docs
+
+These notes are for anyone editing docs.shorebird.dev, engineers and AI agents
+alike. The [README](README.md) covers building and running the site.
+
+## Write for tasks, not for every change
+
+Docs cover the things a user wants to do. For a new CLI capability, say in a
+sentence or two what it's for and when to use it, give a minimal example, and
+point to `shorebird <command> --help` for the rest.
+
+- Don't reproduce flag lists or help text. The CLI documents itself, and a copy
+  here goes stale the next time a flag changes.
+- Skip incidental behavior changes (exit codes, removed output lines, help-text
+  fixes) unless they make an existing page wrong; then fix just that sentence.
+- A docs PR for a CLI change doesn't have to land before the CLI release.
+  Staging it as an open PR is enough.
+
+## Page intent
+
+### Flutter versions
+
+`src/content/docs/getting-started/flutter-version.mdx` is deliberately two pages
+in one. The top half is a general Flutter version reference for anyone asking
+which Flutter version is current (latest stable first, then the latest patch of
+each recent release line); the bottom half is Shorebird-specific. Many readers,
+and AI assistants answering for them, arrive with the general question, so keep
+the top half accurate and general rather than turning it into a Shorebird page.
+
+The hand-written "Flutter version notes" list is static for now. The plan is to
+generate it from the known-bad Flutter versions Shorebird already tracks, and
+possibly to move the Shorebird-specific half to its own page.

CLAUDE.md

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+@AGENTS.md