## What changed
Add `thread/memory/read` to return `{summary}` for a thread that has been started or resumed. Read `memory_summary.md` from the thread's resolved memory version, honoring thread-specific configuration overrides without falling back to another version.
Return `null` when memory use is disabled or the selected summary is missing, unreadable, or blank.
## Testing
Extend app-server integration coverage to check explicit and automatic memory version selection, disabled memory use, and missing summaries without fallback.
GitOrigin-RevId: b218f31e379c69ccbacb444bb9d6ee920cd4882b
## Why
Profiles without a v1 memory workspace have no legacy context to preserve or consolidate before using v2.
## What changed
- Select v2 when memories are enabled and the `memories` directory is absent. Preserve explicit `memories.version` settings, the `memories.dual_write = false` opt-out, and the v1 default for existing workspaces or filesystem check errors.
- Report `v2_ready` immediately for profiles without a v1 workspace. Keep the consolidation count and valid-summary requirements for profiles with a v1 workspace.
- Make resetting an absent memory workspace a no-op so it does not create an unused v1 directory.
## Testing
Extend coverage for default and explicit version selection, opt-outs, version-specific memory reads, fresh-profile readiness and reset behavior, and running only the v2 pipeline for fresh profiles.
GitOrigin-RevId: a8fb0844962ae9266ffbe88af97e8dc4a99ac15f
## What changed
- Consolidate v2 rollout summaries into `memory_summary.md` without generating `raw_memories.md` or requiring `MEMORY.md`. Validate the summary's required sections and size below 10,000 UTF-8 bytes.
- Add v2 read instructions for selective history retrieval, evidence-grounded preferences, citations, and explicit memory edits. Split injected instructions into fragments to preserve the complete summary within fragment byte limits.
- Record memory citation usage in the store selected by `memories.version`.
## Testing
Add coverage for v2 consolidation without a handbook, summary validation, version-isolated memory reads, and resetting both memory versions while preserving threads.
GitOrigin-RevId: 1d895fb4a23a973f1a45ba03be07a1f480c10227
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