Graph: deduplicate directed neighbor queries

[fubhy]

Summary

• deduplicate public directed neighbor-node queries while preserving first physical edge occurrence order
• keep traversal, topological sorting, weighted algorithms, and physical edge storage multiplicity-preserving
• cover outgoing and incoming parallels, loops, reciprocal edges, cold and warmed immutable/mutable inputs, and algorithm regressions

Plan

• PR ID: S05
• Depends on: Graph: stabilize traversal configuration #7273 (graph-s04-traversal-config), now merged
• This PR was developed stacked on graph-s04-traversal-config; Graph: stabilize traversal configuration #7273 merged and its branch was deleted before PR creation, so S05 was retargeted to main
• Deferred: benchmark/runtimeperf validation is intentionally out of scope for this cycle

Validation

• pnpm lint-fix
• pnpm test --run packages/effect/test/Graph.test.ts
• pnpm lint
• pnpm check
• git diff --check origin/main..HEAD

Changeset

• .changeset/unique-directed-neighbors.md (effect patch)

[changeset-bot]

🦋 Changeset detected

Latest commit: 89f2803

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 30 packages

Name	Type
effect	Patch
@effect/ai-anthropic	Patch
@effect/ai-openai	Patch
@effect/ai-openai-compat	Patch
@effect/ai-openrouter	Patch
@effect/atom-react	Patch
@effect/atom-solid	Patch
@effect/atom-vue	Patch
@effect/docgen	Patch
@effect/doctest	Patch
@effect/openapi-generator	Patch
@effect/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-deno	Patch
@effect/platform-node	Patch
@effect/platform-node-shared	Patch
@effect/sql-clickhouse	Patch
@effect/sql-d1	Patch
@effect/sql-libsql	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-pglite	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-do	Patch
@effect/sql-sqlite-node	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch
@effect/vitest	Patch

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[github-actions]

Bundle Size Analysis

Generated from PR build output; treat the content below as untrusted.

File Name	Current Size	Previous Size	Difference
basic.ts	6.96 KB	6.96 KB	0.00 KB (0.00%)
batching.ts	9.76 KB	9.76 KB	0.00 KB (0.00%)
brand.ts	6.55 KB	6.55 KB	0.00 KB (0.00%)
cache.ts	10.67 KB	10.67 KB	0.00 KB (0.00%)
config.ts	21.10 KB	21.10 KB	0.00 KB (0.00%)
differ.ts	20.04 KB	20.04 KB	0.00 KB (0.00%)
http-client.ts	21.64 KB	21.64 KB	0.00 KB (0.00%)
logger.ts	10.91 KB	10.91 KB	0.00 KB (0.00%)
metric.ts	8.89 KB	8.89 KB	0.00 KB (0.00%)
optic.ts	6.71 KB	6.71 KB	0.00 KB (0.00%)
pubsub.ts	14.94 KB	14.94 KB	0.00 KB (0.00%)
queue.ts	11.61 KB	11.61 KB	0.00 KB (0.00%)
schedule.ts	10.77 KB	10.77 KB	0.00 KB (0.00%)
schema-class.ts	19.66 KB	19.66 KB	0.00 KB (0.00%)
schema-fromJsonSchemaDocument.ts	29.61 KB	29.61 KB	0.00 KB (0.00%)
schema-representation-roundtrip.ts	25.85 KB	25.85 KB	0.00 KB (0.00%)
schema-string-transformation.ts	13.53 KB	13.53 KB	0.00 KB (0.00%)
schema-string.ts	11.03 KB	11.03 KB	0.00 KB (0.00%)
schema-template-literal.ts	15.33 KB	15.33 KB	0.00 KB (0.00%)
schema-toArbitrary.ts	21.78 KB	21.78 KB	0.00 KB (0.00%)
schema-toCodeDocument.ts	24.21 KB	24.21 KB	0.00 KB (0.00%)
schema-toCodecJson.ts	19.00 KB	19.00 KB	0.00 KB (0.00%)
schema-toEquivalence.ts	18.82 KB	18.82 KB	0.00 KB (0.00%)
schema-toFormatter.ts	18.69 KB	18.69 KB	0.00 KB (0.00%)
schema-toJsonSchemaDocument.ts	22.85 KB	22.85 KB	0.00 KB (0.00%)
schema-toRepresentation.ts	19.33 KB	19.33 KB	0.00 KB (0.00%)
schema.ts	18.91 KB	18.91 KB	0.00 KB (0.00%)
stm.ts	12.69 KB	12.69 KB	0.00 KB (0.00%)
stream.ts	9.71 KB	9.71 KB	0.00 KB (0.00%)