## Why
Contextual fragments and extension-owned world-state sections currently return strings, limiting them to text content.
## What changed
- Return `ContentItem` from fragment bodies and rendering, preserving classification and attribution. Apply text markers only to `InputText`; pass other content through unchanged.
- Allow extension prompt and world-state contributions to carry typed content, and preserve media in context-window hints.
- Hash non-text world-state fragments by their serialized content and role while retaining the existing text hashing behavior.
- Add shared content-to-tool-output conversion that preserves image references, image detail, and audio.
## Testing
Add coverage for typed world-state hashing and preservation of image content and attribution. Expand code-mode output tests to cover input text, output text, file-backed and inline images, and audio.
GitOrigin-RevId: 2ed00d466a3f169b151202f3eef71e667ea64be1
## What changed
Replace duplicated content-kind strings with constants shared by fragment producers and consumers, including authorization checks, forked-history filtering, and memory instructions. Share the compaction summary kind between core and Guardian's transcript filter.
## Testing
Add a regression test verifying that Guardian excludes compaction summaries while retaining surrounding user messages, including a user message with identical text.
GitOrigin-RevId: 36dbdf0f82c61b52d2571ac1c392fb151c98151b
## Why
World-state sections could return only a single optional text fragment, with message separation controlled by the fragment itself. They could not contribute explicit `ResponseItem` values alongside instructions.
## What changed
- Let sections return ordered `WorldStateUpdate` values containing fragments or response items, with `Prefix`, `Standalone`, or `Mergeable` placement.
- Preserve explicit item boundaries when grouping context updates, and place prefix updates first when assembling initial context.
- Move standalone-message decisions from fragments to world-state updates and retain snapshot handling.
## Testing
Add tests for mixed fragment/item ordering, role and standalone boundaries, initial-context prefix placement, and snapshot restoration without repeated updates.
GitOrigin-RevId: c2514c3c98538da83f5140c10a9d89f531de6549
Move `extraction_messages` from `MemoryContextFragment` in `codex-core` to
`codex-rs/memories/write/src/rollout_input.rs` and update the phase-one caller.
Preserve the existing 8,900-byte chunk limit and Unicode-safe boundaries.
Move the accompanying test with the helper, retaining coverage that bounded
user messages reconstruct the original evidence without loss.
GitOrigin-RevId: 48ac501acbfa50c4195195fd40efc7588a6c714d
## Why
Memory extraction has a limited rollout budget. Select evidence by source so human input and assistant final responses take priority over commentary, context, and tool output.
## What changed
- Use tiered selection for memory v2, preferring newer evidence within each tier and rendering selected items in chronological order with omission markers.
- Keep answered `request_user_input` questions alongside human replies, label evidence sources, replace message media with placeholders, and bound tool output and individual rows.
- Add typed memory context fragments with bounded messages and Unicode-safe extraction chunking.
## Testing
Add tests for memory v2 startup using tiered input and for extraction chunks preserving Unicode evidence within message bounds.
GitOrigin-RevId: 1b2bba4e3264b4fda271e429ad3b7d5f69caed59
pakrym-oai