feat(plane): memory store (file and MinIO) and the remember task (harnessx-removal task 2)

plane/memory.py: the MemoryStore interface with FileStore (index.jsonl, facts by
content hash, repos/<host>__<owner>__<name>/<pin>.jsonl, idempotent ingest,
deterministic row ids, refusal below 1 GiB free naming the path) and MinioStore
(object metadata and tags, S3 Select pushdown probed once per process with a
logged local fallback, object version ids on every row read, versioning and
runs/ lifecycle helper, presigned URLs). OUSAST_MEMORY selects the backend;
MINIO_* settings come from .env; the minio SDK is the optional extra `minio`.

plane/tasks/remember.py: model-free rows (facts, verdict, unit_cost, alert)
from a case's artifacts; remember_run computes them on the host for a recorded
run without writing into it. reconciler.mark_done (477 lines total), seed
before and ingest after `ousast plane run`, `ousast plane remember <run>`.
The generator annotates each repo-facts Task with openultrasast.io/memory-key
(repo, pin, candidates digest, image digest) and the Run with its population
and split; plane/ regenerated.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo

tests/fixtures/plane-remember/validation-46/lmdeploy-media-url-ssrf-vb/summary.json

@@ -0,0 +1,16 @@
+{
+ "status": "done",
+ "units_done": 1,
+ "units_total": 1,
+ "usd": 0.009799,
+ "calls": 7,
+ "usage": {
+  "prompt_tokens": 61163,
+  "prompt_cache_hit_tokens": 46464,
+  "completion_tokens": 2031
+ },
+ "priced": true,
+ "model": "deepseek-flash",
+ "pass": "b",
+ "family": "untrusted_destination"
+}