switch command

[skarim]

Add gh stack switch command

Adds a new switch navigation command that shows an interactive picker for switching to any branch in the current stack. Branches are displayed top-to-bottom with their position number:

Select a branch in the stack to switch to
  5. frontend
  4. api-endpoints
  3. auth-layer
  2. db-schema
  1. config-setup

[Copilot]

Pull request overview

Adds a new gh stack switch CLI command that interactively lets users pick and check out another branch within the current stack.

Changes:

• Introduces gh stack switch command implementation and wires it into the root command.
• Adds test-only selection injection (Config.SelectFn) to allow deterministic interactive-selection tests.
• Updates CLI reference docs and README to document the new command.

Show a summary per file

File	Description
internal/config/config.go	Adds SelectFn hook to simulate interactive selection in tests.
cmd/switch.go	Implements the switch command with an interactive picker and checkout behavior.
cmd/root.go	Registers the new switch command under gh stack.
cmd/switch_test.go	Adds unit/integration-style tests for selection behavior, ordering, and error cases.
docs/src/content/docs/reference/cli.md	Documents gh stack switch usage and example output.
README.md	Adds switch to the command list and examples.

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• Files reviewed: 6/6 changed files
• Comments generated: 3