Context

Found during #2529 UI remnants audit (F3). The agentBadgeText function at ui/src/ui/views/agents-utils.ts:104-106 still returns a "default" pill badge when agentId === defaultId, rendering via <span class="agent-pill">default</span> at views/agents.ts:133, 260.

This contradicts #2286's explicit intent:

"Remove isDefault field from AgentSummary, AgentHealthSummary, and all UI types — agents now display in agents.list order with no special "default" marker"
"Strip (default) / [default] badges from all display output: health, agents list, TUI, channels add, Web UI agent panels and nodes"

#2286 stripped the (default) / [default] bracketed forms but left the bare-text pill form in place.

Scope

Caveat

Backend defaultId field is LIVE — emitted by src/commands/status.agent-local.ts:21, 87, used for agent pre-selection (app-settings.ts:220, app-render.ts:117,155,569, app-chat.ts:221,232). This issue removes only the visual pill, not the underlying defaultId data flow.

Acceptance Criteria

• agentBadgeText and call-sites removed
• Agent pre-selection via defaultId still works (verify via browser smoke test)
• .agent-pill base + .agent-pill.warn rules preserved (still used for "missing" indicator)
• pnpm check passes
• pnpm test:ui:smoke passes

Size estimate

~15 LOC removed across agents-utils.ts + agents.ts.

Related

• Parent audit: spike(ui): re-audit prior gut areas for UI remnants (session-cost, model-fallback, default-agent) #2529
• Prior gut: gut(agents): replace default-agent display ordering with list-order semantics #2286 (incomplete — stripped bracketed forms but left bare pill)