Add cancellable operations and Abort support

[javisperez]

• Introduce cancellable CLI operations and AbortSignal handling across the library.
• Added CancellablePromise type and cancellable(fn) helper in core/exec
• Extended runCommand to accept an AbortSignal (kills child with SIGTERM and rejects with AbortError), and exported CancellablePromise from the public API.
• Updated pack, pull and unpack to return CancellablePromise and wire cancellation into runCommand.
• Updated tests to cover AbortSignal behaviour and cancel() semantics, and adjusted existing tests to expect the signal argument.
• Bumped package version to 0.1.0.

[Copilot]

Pull request overview

Adds first-class cancellation support for long-running KitOps CLI operations by introducing a CancellablePromise abstraction, wiring AbortSignal through runCommand, and updating key command wrappers/tests accordingly.

Changes:

• Added CancellablePromise<T> (public type) and cancellable(fn) helper to expose .cancel() on async operations.
• Extended runCommand to accept an AbortSignal, terminate the spawned child on abort, and reject accordingly.
• Updated pack, pull, and unpack to return CancellablePromise<void> and adjusted/added tests; bumped package version to 0.1.0.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/types/kitops.ts	Introduces the public CancellablePromise<T> type and documentation.
src/index.ts	Re-exports CancellablePromise from the public API surface.
src/core/exec.ts	Adds AbortSignal support to runCommand and implements cancellable() helper.
src/core/tests/exec.spec.ts	Adds tests covering abort semantics and cancellable() behavior.
src/commands/pack.ts	Returns CancellablePromise<void> and wires internal cancellation into runCommand.
src/commands/pull.ts	Returns CancellablePromise<void> and wires internal cancellation into runCommand.
src/commands/unpack.ts	Returns CancellablePromise<void> and wires internal cancellation into runCommand.
src/commands/tests/pack.spec.ts	Updates mocks/expectations for the new AbortSignal argument and .cancel().
src/commands/tests/pull.spec.ts	Updates mocks/expectations for the new AbortSignal argument and .cancel().
src/commands/tests/unpack.spec.ts	Updates mocks/expectations for the new AbortSignal argument and .cancel().
package.json	Version bump to 0.1.0.

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