fix(localnet): always list every registered instance

[zheli]

Summary

localnet list now always shows every registered instance and no longer requires --all to include stopped/failed entries.

Changes

• remove the --all flag wiring from localnet list
• remove running/creating-only filtering from list row collection
• update list text empty-state messaging to match always-show-all behavior
• add regression test coverage for stopped and failed instance visibility
• document this user-visible behavior change in docs/changes-from-proposal.md

Test plan

• make test
• make lint
• scripts/e2e/run-all.sh
• go test ./internal/localnet/ -count=1 -run 'List|StatusGlyph|FormatPort'
• go test ./internal/cli/localnet/ -count=1 -run 'List'

Checklist

• Tests pass locally
• No coverage regression on touched code
• Docs updated (and website/ synced if any mirrored docs/*.md changed)
• CLI ↔ Web UI parity maintained (or follow-up issue + TODO(#issue) comment)