Add the user-facing and API-reference docs that explain how an employee
can declare a primary knowledge base, what the runtime fallback chain
looks like, and how the binding is driven from the API.
agents.md (zh + en)
- New section "Knowledge base binding (per-agent primary KB)" right after
the tool-binding section, with a 1.5.0 New In badge
- Lays out the design intent explicitly: KBs stay workspace-shared, the
binding only chooses a default target, multiple agents may pick the
same KB as primary
- Documents the runtime resolution order used by wiki tools: explicit
kbName/kbId, agent.primaryKbId, most-recently-updated workspace KB
- Migration note about the legacy kb.agent_id to agent.primary_kb_id
backfill and the visibility change for anyone who relied on the old
one-to-one isolation
api.md (zh + en)
- Under Agents: document the primaryKbId field with the three-state PUT
semantics (omit / null / value) and example curl calls
- Under LLM Wiki: document GET /api/v1/wiki/knowledge-bases/bindable and
the explicit warning that PUT /api/v1/wiki/knowledge-bases/{id} no
longer processes the agentId field
