feat(cli): add delete commands for user, project, publisher

[Arlodotexe]

Summary

Add first-class delete commands for the three core entities (user, project, publisher) to allow targeted cleanup and parity with existing create/get/list flows.

Motivation

• Provide a focused delete operation to remove a problematic entity without deleting the entire repo.
• Feature parity: create/get/list existed for all three entities; delete was missing.

What’s in this PR

• New CLI commands:
  • user delete — wacsdk user delete --repo <repo-id> --user-id <ipns-id>
  • project delete — wacsdk project delete --repo <repo-id> --project-id <ipns-id>
  • publisher delete — wacsdk publisher delete --repo <repo-id> --publisher-id <ipns-id>
• Commands are registered within their respective command groups.
• Calls through the SDK repositories to resolve a modifiable instance and invoke DeleteAsync, then saves repo settings.
• XML docs added to satisfy WarningsAsErrors.

Implementation notes

• Repositories: RepositoryContainer is used to compose interdependent repositories.
• Delete flow: GetAsync(id) → cast to modifiable type → Repository.DeleteAsync(modifiable, ct) → repoSettings.SaveAsync(ct).
• No manual cleanup fallback logic is included; the commands are intentionally straightforward.

Usage examples

wacsdk user delete --repo default --user-id k51qzi5uqu5dl...
wacsdk project delete --repo default --project-id k51qzi5uqu5ab...
wacsdk publisher delete --repo default --publisher-id k51qzi5uqu5xy...

Testing / Verification

• Built locally with warnings-as-errors; added XML comments to new public members.
• Manual smoke tests:
  • Create an entity, then delete it; list no longer shows the entity.
  • Delete logs indicate key removal via the repository base logic and settings save completes.

Breaking changes

• None. Adds new commands only.

Future work

• Consider a soft-delete flag (e.g., unlist then purge) if user workflows need it.
• Add unit/integration coverage for delete flows if a test harness is extended for IPNS key lifecycle.

Checklist

• Commands added and wired into command groups
• Build passes locally with warnings-as-errors
• Minimal logs and help text added

Branch

feat/entity-delete-commands

[yoshiask]

Looks good to me 👍