perf(server): index OpenCode text by message and drop unused tool parts

[leoisadev1]

Problem

The legacy OpenCode adapter retained every part in a Map<string, Part>, including growing tool output, and scanned that map on each assistant metadata event. It also accumulated unused live turn items. Long sessions kept payloads that no reader needed. Individually removed text parts could also be emitted again after late assistant metadata arrived.

Adaptation

• Keep only per-message text and reasoning state for later PATCH edits and delta merging.
• Emit tool lifecycle events without caching tool input or output in the session map.
• Remove the unused live turn-item history array.
• Clear cached text for both whole-message and individual-part removal events.

This does not change native event log filtering. That belongs to the projection performance work already merged through #240. OpenCode Go stays on Mastra.

Upstream

Adapted from pingdotgg/t3code#9684, #9738, and #10116.

Verification

• vp test run apps/server/src/provider/Layers/OpenCodeAdapter.test.ts — 44 tests passed, including individual part removal and late assistant metadata after 24 completed tool parts.
• Server typecheck passed.
• Targeted lint and formatting passed.

Made with GPT-5.6 Sol in T3 Code through the Codex harness.

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Project	Deployment	Actions	Updated
akeru-bot-landing	Building	Preview	Sep 10, 2026 6:32pm UTC

[greptile-apps]

Greptile Summary

This update clears retained OpenCode text state when an individual message part is removed, so later assistant metadata updates cannot re-emit content that OpenCode has deleted. Regression coverage and provider documentation were updated alongside the adapter behavior.

Confidence Score: 5/5

Safe to merge; there are no outstanding blocking findings.

The previously reported stale-content issue is resolved in the current code: message.part.removed removes the corresponding retained text part, preventing a later message.updated event from emitting deleted content. greptile-apps[bot] resolved the prior thread without explanation.

_{Reviews (2): Last reviewed commit: "Merge remote-tracking branch 'origin/mai..." | Re-trigger Greptile}