Teach agents to reuse stored HEY authentication

[robzolkos]

Summary

• direct agents to reuse stored HEY credentials instead of starting browser OAuth before data commands
• reserve hey auth status --json for explicit checks and hey auth login for interactive recovery
• document HEY_NONINTERACTIVE=1 as the no-prompt guarantee for unattended PTY sessions
• cover the embedded guidance and non-interactive prompt behavior with regression tests

Validation

• GOWORK=off make check
• GOWORK=off make build
• fresh isolated Pi agent with available credentials ran the requested data command directly, without a status preflight or login
• fresh isolated Pi agent receiving an exit-code-3 auth error reported the task blocked without attempting login
• fresh isolated Pi agent asked explicitly for authentication status ran only hey auth status --json

Fixes #147

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Summary by cubic

Agents now reuse stored HEY credentials instead of running a browser OAuth preflight before data commands, so unattended runs no longer trigger unnecessary login prompts.

• hey auth status --json is reserved for explicit checks; the skill no longer directs agents to run it as a preflight.
• HEY_NONINTERACTIVE=1 is now documented as the no-prompt guarantee for unattended PTY sessions.
• Added regression tests for the embedded skill guidance and non-interactive prompt behavior.

Fixes #147.

^{Written for commit 13b2677. Summary will update on new commits.}

[Copilot]

Pull request overview

Updates embedded agent guidance to reuse stored credentials and avoid unattended OAuth prompts.

Changes:

• Directs agents to run data commands without authentication preflights.
• Documents HEY_NONINTERACTIVE=1 for unattended PTY sessions.
• Adds regression coverage for guidance and prompt suppression.

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Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
skills/hey/SKILL.md	Revises authentication guidance and examples.
skills/embed_test.go	Verifies embedded authentication guidance.
internal/cmd/root_test.go	Tests non-interactive prompt suppression.

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