retryCount in format.json_schema breaks structured output on opencode >=1.18 (HTTP 400 "Upstream request failed") #226

Problem

Auto-capture / profile learning via the opencodeProvider path always fails against opencode 1.18.10. The error surfaces misleadingly as:

opencode reported APIError: Error from provider (Console Go): Upstream request failed; details={"statusCode":400}

The provider is a red herring — the request never reaches it. opencode's own log shows the real cause:

level=WARN message="schema rejection" kind=Body
reason="Expected OutputFormatJsonSchema, got {\"type\":\"json_schema\",\"schema\":{...},\"retryCount\":2}
       at [0][\"info\"][\"format\"]"

Root cause

dist/services/ai/opencode-provider.js builds the session prompt format as:

format: {
  type: "json_schema",
  schema: args.jsonSchema,
  ...(args.retryCount !== undefined ? { retryCount: args.retryCount } : {}),
},

retryCount is a field of opencode's OutputFormatJsonSchema type, not a top-level sibling of type/schema. opencode's request-body schema validator rejects the payload with HTTP 400 before any provider is contacted.

Impact

• opencodeProvider / opencodeModel auto-capture always fails → falls back to "External API not configured" (for users who rely on the opencode path, capture silently never works).
• Error message is misleading ("Error from provider … Upstream request failed"), making the true cause hard to find.

Steps to reproduce

1. opencode 1.18.10, opencode-mem 2.22.2.
2. Set opencodeProvider + opencodeModel (e.g. "opencode-go" + "deepseek-v4-flash").
3. Trigger auto-capture (idle session).
4. Observe the HTTP 400 and the schema rejection WARN in ~/.local/share/opencode/log/opencode.log.

Suggested fix

Remove retryCount from the format object (or place it inside the schema per opencode's OutputFormatJsonSchema definition). Workaround that avoids this entirely: configure the manual provider path (memoryProvider: "openai-chat" with an OpenAI-compatible endpoint).

Environment

• opencode: 1.18.10
• opencode-mem: 2.22.2
• OS: Linux (openSUSE Tumbleweed)