fix(memos-local-plugin): add maxTokens to LlmSchema & SkillEvolverSchema

[chouti]

Problem

Reasoning models (e.g. deepseek-reasoner, o1*, gpt-5-thinking) consume hundreds of tokens on chain-of-thought before emitting JSON content. When llm.json reflection / skillEvolver.crystallize is called with the legacy hard-coded max_tokens: 1024, the response is truncated mid-JSON and the bridge logs llm.json malformed 73+ times in a single reflection cycle.

Result: episodes never close, recoveryReason: "dirty_reward_rescore" piles up, and the MemOS viewer reports bridge.status: disconnected even though the daemon is alive.

Reproduction

llm:
  provider: openai_compatible
  endpoint: https://api.deepseek.com/v1
  model: deepseek-reasoner       # or any reasoning model
  apiKey: sk-...
algorithm:
  lightweightMemory:
    enabled: false               # full self-evolution ON

Start bridge with no override of max_tokens. After ~1 episode:

[bridge] llm.json malformed at 2026-06-08T...Z (attempt 1)
[bridge] llm.json malformed at 2026-06-08T...Z (attempt 2)
... × 73

Direct curl confirms root cause: API returns finish_reason: "length" with truncated content.

Fix

Add maxTokens (default 4_000) to LlmSchema and SkillEvolverSchema. Reasonable budget for reasoning models while still clamping below OpenAI's 32k ceiling.

• LlmSchema.maxTokens: NumberInRange(4000, 1024, 32768)
• SkillEvolverSchema.maxTokens: NumberInRange(4000, 1024, 32768)
• Corresponding defaults in defaults.ts for old configs

TypeBox's Value.Default already preserves user-supplied fields, so the change is backward compatible — old configs without maxTokens get the 4_000 default; new configs can override.

Verification

Before patch:

• 73 malformed per reflection cycle
• bridge.status: disconnected

After patch (config unchanged, schema updated):

• 0 malformed across 141 episodes
• bridge.status: connected
• Viewer loads (200 OK on https://memos.aicake.com)

Files changed

• apps/memos-local-plugin/core/config/schema.ts (+15 lines, 2 field defs)
• apps/memos-local-plugin/core/config/defaults.ts (+2 lines, 2 default values)

 apps/memos-local-plugin/core/config/defaults.ts |  2 ++
 apps/memos-local-plugin/core/config/schema.ts   | 15 +++++++++++++++
 2 files changed, 17 insertions(+)