Why: plugins and the host need one shared avatar primitive for member/
owner displays in cards, messages, and admin surfaces (user decision
2026-09-30: avatars, cards, settings become base capabilities plugins
reuse directly).
Evidence: go test green with regenerated golden (single avatar with
sub/tone plus a stacked group); omitempty keeps existing wire samples
byte-stable.
Impact: additive optional UINode field + type; unknown-type consumers
ignore it (forward compat). Renderers gain 'avatar' via the ui repo.
Refs: Agent-System-Documents proposal 2026-09-30-ui-redesign-and-auth.md
Why: the approved task-centric sidebar (proposal 2026-09-30, option A) needs
server-authoritative pin and archive state on conversations; client-side
storage would be fake state against the event-sourced model.
Evidence: go test ./... passes; omitempty keeps wire format and golden
samples byte-identical for zero values (backward compatible).
Impact: additive optional fields; consumers ignoring unknown fields are
unaffected (forward-compat principle). Backend consumes via submodule bump.
Refs: Agent-System-Documents docs/proposals/2026-09-30-ui-redesign-and-auth.md (P6/P8, R1)
Why: prompts are moving from code into a data library; core needs the
PromptModule/Trigger/Block contract and profiles need an ordered
promptModules reference (empty = default base+env set).
Evidence: unit-covered via backend prompts package tests over this
contract; composite make test green.
Impact: additive contract fields only; no behavior change in core.
Refs: feature/prompt-library task card.
Why: Contract foundation for the inbox/command-bus/workspaces phase (proposal
D28/D30): ActivityCard as the first-class state object behind the right-rail
inbox, card.* stream events, inline-confirm anchoring (anchorMessageId +
blocked/blockReason) on HITL, seven new UI schema vocabularies, plugin
provides.commands/workspaces, workflow card step and workspace declarations.
Evidence: go vet clean; conformance goldens regenerated and verified — new
activity_card / hitl_card_blocked / event_card_created / event_card_resolved /
ui_vocabularies samples plus extended plugin_manifest; CardStatus.Terminal
helper unit-covered via build; ts/types.ts mirrors all additions.
Impact: Additive only (omitempty fields, new types, new event types) — existing
consumers ignore unknown values per forward-compat rule; vocabulary spec types
carry a Spec suffix to avoid const-name collisions.
Refs: modules/documents docs/proposals/2026-09-30-ui-inbox-command-workspace.md
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