feat: add bucket management actions

[goanpeca]

Summary

• add create-bucket, delete-bucket, and list-buckets actions backed by the B2 SDK bucket APIs
• add bucket-type and bucket-info parsing for bucket creation plus bucket-specific outputs
• update action metadata, README docs, dispatcher/output contract tests, and the bundled dist/ entrypoint

Linked issue

Closes #100

Tests run

• pnpm typecheck
• pnpm exec vitest run __tests__/inputs.test.ts __tests__/commands/buckets.test.ts __tests__/main.test.ts __tests__/main-output-contract.test.ts
• pnpm docs:check-action-yml
• pnpm lint
• pnpm spellcheck
• pnpm test
• pnpm build

Follow-up notes

Advanced bucket settings such as CORS, lifecycle, default encryption, retention, and replication remain out of scope for this issue.

[github-actions]

Build artifact for this PR: build.tar.gz (valid 1 hour)

[Copilot]

Pull request overview

This PR expands the action’s command surface to include control-plane bucket administration, aligning the action with the B2 SDK’s bucket APIs and closing the linked issue’s acceptance criteria (create, list, delete empty buckets).

Changes:

• Adds create-bucket, delete-bucket, and list-buckets command implementations and dispatch paths, including bucket-specific outputs and step summaries.
• Introduces bucket-type and bucket-info inputs (with validation/parsing) to support bucket creation metadata.
• Updates action metadata, README documentation, tests (dispatcher + output contract + command tests), and regenerates dist/index.js.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/main.ts	Dispatches new bucket verbs, emits bucket outputs (bucket-*, bucket-count, buckets-listed) and summary-json for bucket results.
src/inputs.ts	Extends action enum, makes bucket optional only for list-buckets, adds bucket-type and bucket-info parsing/validation.
src/commands/buckets.ts	Implements SDK-backed create/delete/list bucket commands with grouped logging and structured results.
README.md	Documents the three new verbs, their inputs, and the new bucket-related outputs.
dist/index.js	Updates the bundled action entrypoint to include the new commands and input parsing changes.
action.yml	Exposes new verbs and inputs, adjusts bucket required-ness, and documents new outputs.
tests/main.test.ts	Extends dispatcher tests to cover the three new actions and their output expectations.
tests/main-output-contract.test.ts	Adds golden output-key sets for bucket actions and mocks the new command module.
tests/inputs.test.ts	Adds coverage for list-buckets bucket optionality, create-bucket parsing, and bucket-info validation.
tests/commands/buckets.test.ts	Adds simulator-backed integration tests for bucket create/list/delete behaviors.
tests/_parsed-inputs.ts	Extends parsed-input test helper defaults with bucketType and bucketInfo.

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