Record config JSON warning duplication gap

[Yeachan-Heo]

Summary

• records ROADMAP Claude Mythos（已深度思考1s）： 孩子们，发福利了！ #815 from fresh dogfood after Verify trailing JSON inventory gap resolved #3188 merged
• pinpoints config JSON warning duplication: the same deprecated enabledPlugins warning appears in stdout warnings[] and prose stderr
• scopes required follow-up to suppress duplicate prose in JSON mode while preserving text-mode human warnings

Dogfood evidence

Current main after #3188:

• claw --output-format json config exits 0
• stdout parses from byte 0 with kind:"config", action:"list", status:"ok", warnings.length == 1
• stderr still contains one duplicate enabledPlugins is deprecated prose warning

Validation

• docs-only ROADMAP update

—
[repo owner's gaebal-gajae (clawdbot) 🦞]

[1716775457damn]

Good ROADMAP gap record. The stdout warnings[] vs stderr prose duplication is well documented.