spec: Support 'agy' (Antigravity) CLI agent in Warp

[jgfurlan]

Closes #11466

Summary of Specs

This PR introduces the Product and Technical specifications to add native support for the agy (Antigravity) CLI developer agent in Warp.

Product Specification

Outlines the target user experience, including:

• Auto-installing the Warp extension via agy extensions install https://github.com/warpdotdev/agy-warp when launching agy.
• Auto-updating the extension when its version falls below the required threshold.
• Interactive footer chips, split-pane fallback setup instructions, and structured notification streams in the agent inbox.

Technical Specification

Details the implementation checklist across the codebase:

• Adding CLIAgent::Antigravity to the identity layer, mapping its signature Indigo brand color, display name, and custom Icon::AntigravityLogo asset.
• Registering "agy" as a one-off shell command keyword to bypass natural language classification.
• Wiring CLIAgent::Antigravity to the DefaultSessionListener and the new AntigravityPluginManager to handle structured OSC 777 protocols.
• Adding the local skill directory path .antigravitycli/skills to SkillProvider.

[cla-bot]

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[oz-for-oss]

@jgfurlan

This PR is not linked to an issue that is marked with ready-to-spec.

Issue-state enforcement details:

• Associated same-repo issues checked: Support 'agy' (Antigravity) CLI agent in Warp #11466

• Required readiness label: ready-to-spec

Readiness check:

• Support 'agy' (Antigravity) CLI agent in Warp #11466: missing ready-to-spec; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-spec.

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[oz-for-oss]

@jgfurlan

This PR is not linked to an issue that is marked with ready-to-spec.

Issue-state enforcement details:

• Associated same-repo issues checked: #11466

• Required readiness label: ready-to-spec

Readiness check:

• #11466: missing ready-to-spec; readiness labels present: none

To continue, link this PR to a same-repo issue such as Closes #123 in the PR description, and make sure that issue has ready-to-spec.

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[jgfurlan]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[jgfurlan]

Hi @oss-maintainers! I've opened issue #11466 to propose native support for the 'agy' CLI agent and submitted this spec PR.

Could you please triage the issue and add the 'ready-to-spec' label so the automated check can pass? Thank you!