fix(cli): include displayName in session ls --json - #6114

Code changes: +2 -0

Tests: +4 -0

Others: +0 -0

What

ao session ls --json now includes each session's displayName (omitted when empty), matching ao session get --json.

Why

Fixes #6113. sessionListEntry had no DisplayName field, so the name set with ao spawn --name (and shown in the sidebar) was dropped from the list JSON even though the session DTO the CLI receives already carries it. Tools supervising many sessions from outside AO had to call get per session to tell them apart.

How

• Add DisplayName string \json:"displayName,omitempty"`tosessionListEntryand copy it from the session DTO when building list entries. Additive,omitempty`, so existing consumers are unaffected.
• No change to the table (non-JSON) output.

Testing

• TestSessionList_JSONOutputDecodes now asserts the fixture's displayName comes through; without the fix the test does not compile (field missing).
• go vet ./... — pass
• go test -race -count=1 ./internal/cli/... — pass
• go test -tags e2e -count=1 ./internal/cli/... — pass
• Not run locally: the full go test -race ./... suite (~20 min); relying on CI for it.

Checklist

• Branched from main
• One focused change; links the related issue
• Follows AGENTS.md conventions and PR hygiene
• Tests added/updated for user-visible behavior
• Relevant CI checks pass for the area touched (full Go suite left to CI, see Testing)