feat: add telemetry notice and preference management

[Hweinstock]

Description

Add first-run telemetry notice and preference management commands to the CLI.

• On first launch (no installationId in ~/.agentcore/config.json), a yellow notice informs users about upcoming anonymous usage analytics and how to opt out.
  • CLI path: notice prints before command output
  • TUI path: notice prints after the TUI exits (avoids being swallowed by the alternate screen buffer)
• agentcore telemetry disable|enable|status subcommands for managing preferences
• 3-tier preference resolution: env var (AGENTCORE_TELEMETRY_DISABLED) > global config > default (enabled)
• ~/.agentcore/config.json for persistent global config (installationId, telemetry preferences)

The AgentCore CLI will soon begin collecting aggregated, anonymous usage
analytics to help improve the tool.
To opt out:          agentcore telemetry disable
To learn more:       agentcore telemetry --help

Related Issue

Closes #

Documentation PR

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

How have you tested the change?

• I ran npm run test:unit and npm run test:integ
• I ran npm run typecheck
• I ran npm run lint
• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

played around with packaged tarball to verify it works e2e.

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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terms of your choice.

[github-actions]

Package Tarball

aws-agentcore-0.7.1.tgz

How to install

npm install https://github.com/aws/agentcore-cli/releases/download/pr-797-tarball/aws-agentcore-0.7.1.tgz

[aidandaly24]

Overall looks good just some comments

[Hweinstock]

lint failure from #697, will fix in a follow-up.