Add agent docs

[aversey]

No description provided.

[Copilot]

Pull request overview

Adds repository “agent” guidance and Copilot review instructions to standardize how contributors build/lint the Hopsworks docs site and how automated agents should review content.

Changes:

• Add agent-facing documentation under .agent/ plus a top-level AGENTS.md.
• Add GitHub Copilot review instructions under .github/.
• Ignore local Claude agent settings via .gitignore and add CLAUDE.md (as a symlink target pointer).

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
CLAUDE.md	Adds a Claude entrypoint that points to the agent instructions.
AGENTS.md	Documents local setup/build/lint commands and high-level docs rules.
.gitignore	Ignores user-specific local agent settings file.
.github/copilot-instructions.md	Defines repo-specific review rules for Copilot (style, nav, linking, code blocks).
.agent/README.md	Central agent command reference and docs structure guidance.
.agent/content.md	Writing conventions, lint rules, code block and linking rules.
.agent/caveats/README.md	Defines caveat format and contribution pattern for caveats.
.agent/caveats/javadoc-stub.md	Documents the local javadoc stub workaround for strict MkDocs builds.

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