## Why
The memories extension now owns the read-path developer instructions it
injects at thread start. Keeping that prompt builder and template in
`codex-memories-read` left the extension depending on a helper crate for
extension-specific prompt assembly, and kept async template/truncation
dependencies in the read crate after the remaining read surface no
longer needed them.
## What changed
- Moved `prompts.rs`, its tests, and `templates/memories/read_path.md`
from `memories/read` into `ext/memories`.
- Wired `MemoryExtension` to call the local prompt builder and added the
moved templates to `ext/memories/BUILD.bazel` compile data.
- Removed the now-unused prompt export and prompt-related dependencies
from `codex-memories-read`.
## Testing
- Not run locally.
## Why
`memory_summary.md` is injected into every session, so its value depends
on staying compact, navigational, and easy to regenerate when the
expected shape changes. The previous consolidation prompt encouraged a
broad actionable inventory and allowed older summary structures to be
patched in place, which makes it easier for stale or overly verbose
summaries to keep accumulating.
This change makes the summary format explicitly versioned and biases
Phase 2 memory consolidation toward denser prompt-loaded context.
## What changed
- Require `memory_summary.md` to begin with an exact `v1` header.
- Teach consolidation to regenerate `memory_summary.md` from scratch
when the header is missing or incompatible, while still allowing
incremental updates to `MEMORY.md`.
- Tighten the `memory_summary.md` instructions so it acts as a compact
routing/index layer instead of a second handbook.
- Lower `MEMORY_TOOL_DEVELOPER_INSTRUCTIONS_SUMMARY_TOKEN_LIMIT` from
`5_000` to `2_500` so the runtime prompt budget matches the denser
summary target.
## Verification
Not run; this is a prompt/template update plus a prompt budget constant
change.
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