[developing-today]

What

Removes the single entry "@openchamber/opencode-claude@1.3.8" from the plugins array in .opencode/opencode.jsonc. Nothing else changes (1 line deleted). This file is the global opencode config: ~/.config/opencode/opencode.jsonc is a symlink to it.

Root cause of the claude-code 404s (opencode#1806)

The stale external plugin @openchamber/opencode-claude@1.3.8 registers a session.model.request hook that rewrites every claude-code provider request baseURL to its own loopback proxy. The native provider then composes POST http://127.0.0.1:<proxy>/v1/v1/messages, and the proxy answers with its own plain-text 404 Not Found. Proven 2026-11-06: removing the plugin restored live Anthropic 200s (PROBEOK on both probe legs, route_attempt outcome success) on fork build 5e9b135f. Both 22c0a6d and 5e9b135f were affected identically — the defect was never in the fork binary, the credential, or the config baseURL; it was this plugin, external to both builds.

Why this PR is time-critical

Production is already running with this exact edit as an uncommitted working-tree change in the primary checkout (applied as the stopgap through the ~/.config/opencode/opencode.jsonc symlink). The resulting file blob is 885d480582 — byte-identical to this PR branch. Until this lands, any checkout/pull/rebuild that refreshes the working tree resurrects the plugin and re-breaks claude-code; Drew's pending #5647 switch makes that window concrete. This PR makes the production-proven bytes the committed state.

Verification

• Branch file blob 885d48058235a431ba3ced9a219dfbfd731c037b == the live production file currently serving GREEN probe legs.
• grep opencode-claude over the whole repo tree: this was the only occurrence.
• All other plugin entries untouched.

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