[vector store 8/10] Let a deployment tune a Qdrant collection's HNSW, optimizers and quantization

[edwinyyyu]

Purpose of the change

QdrantConf gains hnsw_config, optimizers_config and quantization_config, plain mappings mirroring qdrant-client's HnswConfigDiff, OptimizersConfigDiff and QuantizationConfig, so qdrant-client stays optional for configuration parsing; the store's params validate them against qdrant's own models. They apply to the store's one collection (its registry is SQL tables since #1631). The sample configurations and the configuration docs' parameter table carry the three keys.

m must be 0 or unset: the collection is multi-tenant and disables the global graph in favor of per-partition payload indexing, so a deployment tunes payload_m, which defaults to 16 as before.

Stack

21 PRs on main: 7 independent ones directly on main, then the vector store chain stacked on them, then the SQLite store fixes stacked on the chain. A stacked PR's diff on GitHub is cumulative until the PRs under it merge.

#	PR	change
		Independent PRs, each directly on main; review and merge in any order:
—	#1541	fix(event-backend): make expand_context return timeline-neighbor episodes
—	#1661	Overhaul segment store: shared tables with incarnation-scoped tenant keys (port of #1548)
—	#1460	Publish vector index files atomically (but not durably) (as merged into speedkick, #1588)
—	#1671	Remove custom sharding from the Qdrant store (port of #1654)
—	#1630	Bound every request to a remote vector store by a configured timeout
—	#1682	Hand the Qdrant vector store a metrics factory, so its tracker emits (port of #1532)
—	#1624	Make no memory request create a project
		The vector store chain, stacked on the independent PRs, merged bottom-up:
[vector store 1/10]	#1663	Answer with cosine scores and uuids, not vectors and stale properties, and require a vector on the record (port of #1598 and #1603)
[vector store 2/10]	#1670	Remove per-project filterable properties (port of #1606)
[vector store 3/10]	#1622	Create a session's storage with the session, never on a request
[vector store 4/10]	#1625	Remove open-or-create and close from both stores
[vector store 5/10]	#1626	Rename logical collection to partition, and open to get, on both stores
[vector store 6/10]	#1627	Make a vector store one collection, with string-keyed partitions
[vector store 7/10]	#1631	Mint an incarnation per partition life in a SQL-arbitrated registry; delete logically, reclaim by purge, and keep the tombstone until a clean sweep and a retention
[vector store 8/10]	#1618 (this PR)	Let a deployment tune a Qdrant collection's HNSW, optimizers and quantization
		The SQLite store fixes, stacked on [vector store 8/10]:
[sqlite store fixes 1/6]	#1469	Never reuse a row id in SQLiteVectorStore (as merged into speedkick, #1589)
[sqlite store fixes 2/6]	#1672	Own the search engine's concurrency in the store, not in each engine (port of #1612)
[sqlite store fixes 3/6]	#1673	Serialize a partition's writes so the engine sees them in order (port of #1607)
[sqlite store fixes 4/6]	#1674	Refuse a pending row replay cannot honor, instead of dropping it (port of #1608)
[sqlite store fixes 5/6]	#1675	Take SQLite's write lock at BEGIN, not at the first write (port of #1609)
[sqlite store fixes 6/6]	#1676	Give every write a fresh row id, so a key names one version (port of #1610)
		Parked on speedkick until #1684 (the port of #1597: EventMemory session, source and expansion) is stacked under them on main:
[vector store 9/10]	#1628	Make a vector store filter only on the properties it declares
[vector store 10/10]	#1616	Close the filter union, and make negation the complement on every backend

This PR's own change is its 2 commits, 75ece3878, c533194d2; the rest of its diff is the PRs under it. Stacked on #1631; #1469 is stacked on it.

Verification

On main ff58f38c (2026-09-17, after the review round of the same day). ruff check, ruff format --check and ty check clean at every commit of the chain and fixes and on every independent PR. pytest packages/server/server_tests -m 'not integration': green on each independent PR alone (1869–1926 passed, 3 skipped), 1957 passed on the seven together, 1905 passed on the chain's tip (c533194d) and 1929 passed / 3 skipped on the stack's tip (b21343e5); the vector store and resource manager suites at every commit. pytest packages/client/client_tests: 255 passed.

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