doublezero link topology subcommands

[ben-malbeclabs]

Add doublezero link topology create, delete, clear, and list subcommands. list resolves pubkeys to names and warns if a topology appears disconnected (fewer links than required for a connected path).

doublezero link topology create --name <NAME> --constraint <include-any|exclude>
doublezero link topology delete --name <NAME>
doublezero link topology clear  --name <NAME>
doublezero link topology list

Milestone: RFC-18: CLI
RFC: #3288

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Files affected:

• smartcontract/cli/src/link/topology/ (new subcommand directory)

Size: Medium

Tests:

• Create round-trip
• List output format with resolved names and derived color
• Clear sweep is idempotent
• Delete blocked if links still reference topology

Blockers: #3344 (TopologyInfo account)

[ben-malbeclabs]

Implemented in #3512 (RFC-18 PR 2).