Open the ACP tool-call enums at the wire boundary (M4)

[SawyerHood]

What was wrong

plugins/provider-acp/src/wire.ts parsed the ACP tool-call kind and status with closed zod enums. ACP's ToolKind is an open enum upstream (#[serde(other)]; the v2 draft adds Unknown(String), an open status, and cancelled), and the v1 schema already has switch_mode, which the enum did not list. One unseen value failed the whole tool_call parse, so the call never opened and its later completed update merged into nothing: the row was lost. The same schema drove the permission request's toolCall, and a foreign content entry dropped the call the same way. This is the M4 finding of the ACP tool-reporting spike (a live data-loss bug).

What changed

• A z.preprocess boundary on the tool-call schemas (acpToolCallUpdateEventSchema, the permission toolCall) normalizes the enums before validation: an unknown kind parses as other and the agent's own word survives on rawKind; an unknown status parses as pending; null reads as absent.
• switch_mode is a known kind (presentation: "Switching mode" / SlidersHorizontal). The v2 cancelled status is terminal and settles the item as interrupted.
• content entries parse one at a time: an entry of an unknown type is skipped, the call keeps the rest.
• The generic tool item names itself by rawKind ?? kind so a deploy call reads tool: "deploy", and the merge cache carries rawKind through updates.

No grammar change, no wire change to the daemon.

How I verified

• New tests in wire.test.ts (unknown kind/status, switch_mode + cancelled, null enums, foreign content entry, the permission request path) and delta-translation.test.ts ("keeps a call whose kind the schema does not know": the call now opens under its own kind word and the completed update closes the same item; a cancelled close is interrupted). All fail on main.
• pnpm exec turbo run typecheck test --filter=bb-plugin-provider-acp: 15 files, 203 tests pass, including the recorded acp-cursor conformance cells.

Part of the WS2b ACP stack (kit + plugin-owned agents + ACP tier deletion). This is the bottom layer.

AGENT GENERATED: by Claude Opus 5