Closes Sprint 2 design-bar work (audit reports/scrum/sprint-backlog.md):
S2.1 — ADR-004 documents the pathway-memory data model
S2.2 — pathway port lands with deterministic fixture corpus
and full test coverage on day one
S2.3 — retired traces are excluded from retrieval (test
passes; would fail without the filter)
Mem0-style operations: Add / AddIdempotent / Update / Revise /
Retire / Get / History / Search. Each operation is a method on
Store; persistence is JSONL append-only with corruption recovery
on Replay.
internal/pathway/types.go Trace + event + SearchFilter + sentinel errors
internal/pathway/store.go in-memory state + RWMutex + ops
internal/pathway/persistor.go JSONL append-only log with replay
internal/pathway/store_test.go 20 test funcs covering all 7
Sprint 2 claim rows + concurrency
internal/pathway/persistor_test.go 6 test funcs covering missing-
file, corruption recovery, long-line
handling, parent-dir auto-create,
apply-error skip behavior
Sprint 2 claim coverage row-by-row:
ADD TestAdd_AssignsUIDAndTimestamps + TestAdd_RejectsInvalidJSON
UPDATE TestUpdate_ReplacesContentSameUID + Update_MissingUID_Errors
REVISE TestRevise_LinksToPredecessorViaHistory +
TestRevise_PredecessorMissing_Errors +
TestRevise_ChainOfThree_BackwardWalk
RETIRE TestRetire_ExcludedFromSearch +
TestRetire_StillAccessibleViaGet +
TestRetire_StillAccessibleViaHistory
HISTORY/cycle TestHistory_CycleDetected (injected via internal map),
TestHistory_PredecessorMissing_TruncatesChain,
TestHistory_UnknownUID_ErrorsClean
REPLAY/dup TestAddIdempotent_IncrementsReplayCount (locks the
"replay preserves original content" rule per ADR-004)
CORRUPTION TestPersistor_CorruptedLines_Skipped +
TestPersistor_ApplyError_Skipped
ROUND-TRIP TestPersistor_RoundTrip locks the full Save → fresh
Store → Load → Stats-match contract
Two real bugs caught during testing:
- Add returned the same *Trace stored in the map, so callers
holding a reference saw later mutations. Fixed: clone before
return (matches Get's contract). Same fix in AddIdempotent
+ Revise.
- Test typo: {"v":different} isn't valid JSON; AddIdempotent's
json.Valid rejected it as ErrInvalidContent. Test fixed to
use {"v":"different"}; the validation behavior is correct.
Skipped this commit (next):
- cmd/pathwayd HTTP binary
- gateway routing for /v1/pathway/*
- end-to-end smoke
These add the wire surface; the substrate ships first so the
wire layer can be a pure proxy in the next commit.
Verified:
go test -count=1 ./internal/pathway/ — 26 tests green
just verify — vet + test + 9 smokes 34s
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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