v0.8: usage feedback, cited context, and read tools

v0.8 adds a bounded startup snapshot and host-owned read tools without adding settings UI:

When memory is enabled, the current summary.md is injected into the system prompt as a bounded, explicitly untrusted `` data block (16 KiB maximum). An unreadable snapshot falls back to the static memory instructions.
memory.context({ query, limit }) returns bounded memory bodies with stable source citations ([source: ... · id: ...]), while preserving the existing memory.search() API.
Each context read updates metadata-only usage in .sync/usage.json with usage_count and last_usage; the sidecar is private, atomic, and ignored by Git. Existing repositories also receive a local .git/info/exclude entry without changing tracked memory files.
Query matches are selected deterministically, then ordered by usage count, recent use, and path. Expired records are never returned.
The model can call memory_search (ranked snippets) and memory_context (bounded records ordered by usage) as read tools. They return JSON with relative-path citations; the host owns all filesystem access and the model never receives Git or sidecar paths.

dsh-git-memory