fix(config): apply token substitution for OPENCODE_CONFIG_CONTENT

[kdcokenny]

Summary

When config is provided via the OPENCODE_CONFIG_CONTENT environment variable, token substitution ({env:VAR}, {file:path}) was not being applied because the inline JSON was merged directly via JSON.parse() instead of going through the load() pipeline that handles substitution.

This change routes inline config content through load() so that all token references are resolved consistently with file-based configs.

Changes

• packages/opencode/src/config/config.ts: Parse OPENCODE_CONFIG_CONTENT with JSONC, inject $schema if missing, and pass through load() for token substitution
• packages/opencode/test/config/config.test.ts: Add 6 tests covering {env:VAR} substitution, {file:path} substitution, missing file errors, precedence over project config, malformed JSON rejection, and no disk artifact creation

Test command

bun test packages/opencode/test/config/config.test.ts

Fixes #13219

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

No duplicate PRs found

[kdcokenny]

Taken over by #13384