feat: add agentcore art command

[jesseturner21]

Summary

• Adds agentcore art command that displays the AgentCore brain logo as ASCII art
• Adds hidden Moab team credit in README

Test plan

• Run agentcore art and verify ASCII brain renders in cyan

[github-actions]

Package Tarball

aws-agentcore-0.11.0.tgz

How to install

npm install https://github.com/aws/agentcore-cli/releases/download/pr-1000-tarball/aws-agentcore-0.11.0.tgz

[agentcore-cli-automation]

Hidden "Made by the Moab team" comment in README

This adds an internal team credit (as a hidden HTML comment) to an AWS-maintained open-source project's README. That feels out of place for an aws/* OSS repo — individual team attributions aren't really standard here, even hidden ones, and it's the kind of thing that tends to get flagged later.

Options:

• Drop the README change from this PR entirely.
• If you want to credit contributors, use the standard CONTRIBUTORS / AUTHORS mechanism rather than a hidden comment.
• Run it past whoever owns README/branding policy for this repo before merging.

[agentcore-cli-automation]

art command is not hidden — it will show up in the TUI home screen and --help

If this is intended as an easter egg (which the PR framing suggests), it isn't actually hidden:

1. getCommandsForUI in src/cli/tui/utils/commands.ts filters by the HIDDEN_FROM_TUI list (['help', 'telemetry']). Because art isn't in that list, it will appear in the home-screen command list users see when running agentcore with no args.
2. The command is registered without { hidden: true }, so it will also appear in commander's agentcore --help output and in suggestion lists.

To make it a real easter egg, you'll want both:

• Add 'art' to HIDDEN_FROM_TUI in src/cli/tui/utils/commands.ts.
• Register the command with .command('art', { hidden: true }) (or call .hidden() on it) in src/cli/commands/art/command.tsx so it's hidden from commander help output too.

If it's not meant to be hidden, then per the convention in src/cli/tui/copy.ts the description should live in COMMAND_DESCRIPTIONS alongside every other command, and the PR description wording ("hidden Moab team credit") should be updated.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	Unknown%	0 / 0
🔵	Statements	Unknown%	0 / 0
🔵	Functions	Unknown%	0 / 0
🔵	Branches	Unknown%	0 / 0

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