add setup prompts for output etc

[jaxxstorm]

• feat(config): add oauth-backed profiles and age secret encryption
• feat(config): add age key path and interactive profile setup
• feat(config): add interactive setup and age key reuse
• fix(config): block deleting the active tailnet profile
• fix(config): preserve encrypted profile auth and auth precedence
• test(config): cover interactive profile prompts
• feat(config): prompt for output and debug defaults in setup

[Copilot]

Pull request overview

Extends tscli config setup to collect and persist global CLI preferences (output, debug) during first-run setup, and updates config persistence logic so debug is no longer stripped during config rewrites—while ensuring runtime precedence (flags/env over persisted defaults) remains intact.

Changes:

• Add initial-setup-only prompts for default output (json|pretty|human) and default debug logging, persisting both into ~/.tscli.yaml.
• Update config canonicalization to preserve persisted debug while still excluding transient keys (help, base-url).
• Add/adjust unit + integration tests to validate persistence and precedence behavior, and update specs to document the new requirements.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/cli/persistent_prerun_runtime_config_test.go	Adds runtime precedence tests ensuring persisted output/debug are overridden by env/flags.
test/cli/example_output_test.go	Updates config setup golden interaction input to include new prompts.
test/cli/config_profiles_integration_test.go	Verifies new setup prompts/persistence and ensures rerun flows don’t re-prompt for preferences.
pkg/config/profiles_test.go	Ensures profile canonicalization preserves unrelated persisted keys including debug.
pkg/config/config.go	Adds multi-key persistence helpers and stops stripping debug during canonicalization.
openspec/specs/multi-tailnet-config-profiles/spec.md	Documents that initial setup persists output/debug after profile creation.
openspec/specs/interactive-config-setup/spec.md	Documents new initial-setup prompt sequence for output then debug.
openspec/specs/cli-default-output-and-debug/spec.md	New spec defining persisted defaults + precedence order.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/tasks.md	Archived task breakdown for the change set.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/specs/multi-tailnet-config-profiles/spec.md	Archived spec delta for multi-tailnet profiles.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/specs/interactive-config-setup/spec.md	Archived spec delta for interactive setup.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/specs/cli-default-output-and-debug/spec.md	Archived added spec for defaults/precedence.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/proposal.md	Archived proposal describing motivation and impact.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/design.md	Archived design notes and tradeoffs.
openspec/changes/archive/2026-04-15-prompt-setup-output-and-debug/.openspec.yaml	Adds openspec metadata for the archived change set.
cmd/tscli/config/setup/cli_test.go	Adds unit tests for new setup step transitions and preference persistence.
cmd/tscli/config/setup/cli.go	Implements initial-setup-only output/debug steps and persists selected preferences.

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