## Why
Code Mode needs a way to forward mixed MCP tool results while preserving their content types and order.
## What changed
Add `content(block)` and `content(iterable)` so callers can forward tool output with `content(result.content)`. Text, image, and audio blocks become their corresponding output items; resource links and embedded resources are serialized as text. Invalid blocks and encrypted text are rejected, and iterators are closed when a block is rejected.
Share MCP block conversion and image detail types with the protocol layer, while preserving existing `image()` and `audio()` input handling.
## Testing
Add coverage for mixed content ordering, iterator behavior and cleanup, invalid blocks, image metadata, short audio clips, and output suppression after exit. Add an integration scenario verifying that MCP text and image blocks reach the model in order.
GitOrigin-RevId: 83832ec6c530dd35ea1e3373680627997c6e13c1
## What changed
Expose two JavaScript globals for consuming results as inputs settle:
- `as_settled(promises)` returns an async iterator of fulfilled and rejected records in settlement order, preserving queued results while the consumer is busy.
- `stream_settled(promises, emit)` delivers those records to a callback, awaiting each invocation and propagating callback errors.
Records include an `index`, a `status`, and either a `value` or a `reason`. Iterable inputs use positional indices; `Map` inputs retain their keys. Both helpers accept promises, thenables, and plain values.
## Testing
Add runtime coverage for ordering, input types, object identity, callback behavior, early iteration exit, and termination. Add stdio and gRPC host tests for partial results across waits, plus a scenario snapshot verifying fulfilled and rejected records reach the model.
GitOrigin-RevId: cddc9f3679ae04f2421e154caa0417afb15f550d
## What changed
- Move the V8 implementation into a dedicated `codex-code-mode-runtime` crate used by `codex-code-mode-host`, removing the embedded runtime fallback from the Codex process.
- Resolve the host executable from the active installation layout and check its availability before selecting tools.
- Fall back to direct tools with a one-time warning when optional code mode is unavailable. Keep `code_mode_only` and `disable_in_process_fallback` configurations fail-closed.
## Testing
- Cover host discovery for standalone and package layouts, including missing hosts and symlinks.
- Verify direct-tool fallback, one-time warnings, and fail-closed code-mode-only behavior.
GitOrigin-RevId: 5aa3c6f1db148b2231fc24089a2ee0e2b00dbddb
Channing Conger