root b8c072cf0b G1: vectord — HNSW vector search via coder/hnsw · 6 scrum fixes applied
First G1+ piece. Standalone vectord service with in-memory HNSW
indexes keyed by string IDs and optional opaque JSON metadata.
Wraps github.com/coder/hnsw v0.6.1 (pure Go, no cgo). New port
:3215 with /v1/vectors/* routed through gateway.

API:
  POST   /v1/vectors/index            create
  GET    /v1/vectors/index            list
  GET    /v1/vectors/index/{name}     get info
  DELETE /v1/vectors/index/{name}
  POST   /v1/vectors/index/{name}/add (batch)
  POST   /v1/vectors/index/{name}/search

Acceptance smoke 7/7 PASS — including recall=1 on inserted vector
w-042 (cosine distance 5.96e-8, float32 precision noise), 200-
vector batch round-trip, dim mismatch → 400, missing index → 404,
duplicate create → 409.

Two upstream library quirks worked around in the wrapper:
  1. coder/hnsw.Add panics with "node not added" on re-adding an
     existing key (length-invariant fires because internal
     delete+re-add doesn't change Len). Pre-Delete fixes for n>1.
  2. Delete of the LAST node leaves layers[0] non-empty but
     entryless; next Add SIGSEGVs in Dims(). Workaround: when
     re-adding to a 1-node graph, recreate the underlying graph
     fresh via resetGraphLocked().

Cross-lineage scrum on shipped code:
  - Opus 4.7 (opencode):                 0 BLOCK + 4 WARN + 3 INFO
  - Kimi K2-0905 (openrouter):           2 BLOCK + 2 WARN + 1 INFO
  - Qwen3-coder (openrouter):            "No BLOCKs" (4 tokens)

Fixed (4 real + 2 cleanup):
  O-W1: Lookup returned the raw []float32 from coder/hnsw — caller
    mutation would corrupt index. Now copies before return.
  O-W3: NaN/Inf vectors poison HNSW (distance comparisons return
    false for both < and >, breaking heap invariants). Zero-norm
    under cosine produces NaN. Now validated at Add time.
  K-B1: Re-adding with nil metadata silently cleared the existing
    entry — JSON-omitted "metadata" field deserializes as nil,
    making upsert non-idempotent. Now nil = "leave alone"; explicit
    {} or Delete to clear.
  O-W4: Batch Add with mid-batch failure left items 0..N-1
    committed and item N rejected. Now pre-validates all IDs+dims
    before any Add.
  O-I1: jsonItoa hand-roll replaced with strconv.Itoa — no
    measured allocation win.
  O-I2: distanceFn re-resolved per Search → use stored i.g.Distance.

Dismissed (2 false positives):
  K-B2 "MaxBytesReader applied after full read" — false, applied
    BEFORE Decode in decodeJSON
  K-W1 "Search distances under read lock might see invalidated
    slices from concurrent Add" — false, RWMutex serializes
    write-lock during Add against read-lock during Search

Deferred (3): HTTP server timeouts (consistent G0 punt),
Content-Type validation (internal service behind gateway), Lookup
dim assertion (in-memory state can't drift).

The K-B1 finding is worth pausing on: nil metadata on re-add is
the kind of API ergonomics bug only a code-reading reviewer
catches — smoke would never detect it because the smoke always
sends explicit metadata. Three lines changed in Add; the resulting
API matches what callers actually expect.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-29 00:50:28 -05:00

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go.opentelemetry.io/otel/metric v1.39.0/go.mod h1:jrZSWL33sD7bBxg1xjrqyDjnuzTUB0x1nBERXd7Ftcs=
go.opentelemetry.io/otel/sdk v1.39.0 h1:nMLYcjVsvdui1B/4FRkwjzoRVsMK8uL/cj0OyhKzt18=
go.opentelemetry.io/otel/sdk v1.39.0/go.mod h1:vDojkC4/jsTJsE+kh+LXYQlbL8CgrEcwmt1ENZszdJE=
go.opentelemetry.io/otel/sdk/metric v1.39.0 h1:cXMVVFVgsIf2YL6QkRF4Urbr/aMInf+2WKg+sEJTtB8=
go.opentelemetry.io/otel/sdk/metric v1.39.0/go.mod h1:xq9HEVH7qeX69/JnwEfp6fVq5wosJsY1mt4lLfYdVew=
go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
golang.org/x/exp v0.0.0-20260112195511-716be5621a96 h1:Z/6YuSHTLOHfNFdb8zVZomZr7cqNgTJvA8+Qz75D8gU=
golang.org/x/exp v0.0.0-20260112195511-716be5621a96/go.mod h1:nzimsREAkjBCIEFtHiYkrJyT+2uy9YZJB7H1k68CXZU=
golang.org/x/net v0.52.0 h1:He/TN1l0e4mmR3QqHMT2Xab3Aj3L9qjbhRm78/6jrW0=
golang.org/x/net v0.52.0/go.mod h1:R1MAz7uMZxVMualyPXb+VaqGSa3LIaUqk0eEt3w36Sw=
golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
golang.org/x/sys v0.43.0 h1:Rlag2XtaFTxp19wS8MXlJwTvoh8ArU6ezoyFsMyCTNI=
golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260120221211-b8f7ae30c516 h1:sNrWoksmOyF5bvJUcnmbeAmQi8baNhqg5IWaI3llQqU=
google.golang.org/genproto/googleapis/rpc v0.0.0-20260120221211-b8f7ae30c516/go.mod h1:j9x/tPzZkyxcgEFkiKEEGxfvyumM01BEtsW8xzOahRQ=
google.golang.org/grpc v1.80.0 h1:Xr6m2WmWZLETvUNvIUmeD5OAagMw3FiKmMlTdViWsHM=
google.golang.org/grpc v1.80.0/go.mod h1:ho/dLnxwi3EDJA4Zghp7k2Ec1+c2jqup0bFkw07bwF4=
google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=