chore(main): release 2.1.0

[github-actions]

🤖 I have created a release beep boop

2.1.0 (2026-03-11)

Added

• add per-project activation for advisory features (fc57dd2)

Fixed

• add --plugin-dir to activation eval script for CI compatibility (45866e7)
• correct last 2 activation eval test expectations (cb3af25)
• correct test expectations for activation evals (8d3c20a)
• detect API key auth failures in activation eval pre-flight (1ddc554)
• detect billing and rate limit errors in activation eval pre-flight (ed6e8cc)
• install plugin via CLI marketplace for CI activation evals (76156bd)
• register plugin in installed_plugins.json for CI activation evals (c371239)
• use parent directory for --plugin-dir in activation evals (9fe0ded)

Documentation

• add headless mode (claude -p) known limitation to changelog and troubleshooting (f407ef1)

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