Fix target TTY detection, add shorthand --json | -j flag

[austin-denoble]

Problem

Describe the purpose of this change. What problem is being solved and why?

Solution

make sure target cmd detects non-TTY and sets JSON mode automatically, same as login, when pc target needs to authenticate the URL is output to stdout properly, add shorthand --json flag for needed commands

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Describe specific steps for validating this change.

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Note

Medium Risk
Adds a global authentication pre-check for most commands and changes login/target behavior in non-TTY JSON mode, which could affect automation and command execution paths if the skip list or auth detection is incorrect.

Overview
Adds a root-level auth gate for most commands. pc now runs login.EnsureAuthenticated() in PersistentPreRun, with a curated skip list for commands that manage credentials/local state, and auto-detects JSON mode (non-TTY stdout or --json/-j) to format auth errors appropriately.

Improves non-interactive/agentic UX. login and auth login gain -j shorthand and updated help/examples; target now auto-enables JSON mode in non-TTY contexts, supports pc target --json as an auth-free “show current context” path, and centralizes JSON context printing.

Refactors and extends post-auth setup. Login utilities split context initialization into applyAuthContext(), ensure target project state is cleared when no projects exist, keep stdout clean during wait-mode by printing auth URLs to stderr, and introduce EnsureAuthenticated() to lazily complete pending daemon sessions and auto-initialize org/project context after successful browser auth.

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