chore: sync upstream dev into integration #7

Purpose

Synchronize integration/opencode-dev with the audited upstream/dev revision 1882c33827cf0ce5c948b69ab5a87ed8f6790cf8 before configurable discovery-path feature work branches from the integration line.

Scope

• Preserve the six fork-only integration commits.
• Merge upstream history without rebasing or rewriting commit identity.
• Keep this synchronization separate from feature changes.

Verification

• Merge completed without manual conflict resolution.
• bun typecheck passed in packages/core and packages/opencode.
• 104 focused provider and MCP tests passed.
• The pre-push full monorepo typecheck passed for all 30 participating packages.

Completion

origin/integration/opencode-dev contains the audited upstream revision and remains the base for the discovery-path dev topic branch.