Add reproduction for Cause issue

[fubhy]

Summary

Fix Cause.map so transforming typed errors preserves annotations attached to Fail reasons.

Root cause

Cause.map rebuilt each mapped Fail reason with only the transformed error, dropping the original reason's annotations. The mapped reason now receives a copy of those annotations while Die and Interrupt reasons continue to pass through unchanged.

Validation

pnpm test --run packages/effect/test/Cause.test.ts packages/effect/test/CauseMapAnnotations.test.ts
pnpm check
pnpm lint

Closes EFF-313

[changeset-bot]

🦋 Changeset detected

Latest commit: 4f9ffbe

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/opentelemetry	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-deno	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/vitest	Patch
@effect/ai-anthropic	Patch
@effect/ai-openai-compat	Patch
@effect/ai-openai	Patch
@effect/ai-openrouter	Patch
@effect/atom-react	Patch
@effect/atom-solid	Patch
@effect/atom-vue	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/docgen	Patch
@effect/doctest	Patch
@effect/openapi-generator	Patch

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[pullfrog]

✅ No new issues found.

Reviewed changes

• Reproduction test for Cause.map annotation loss — single test in packages/effect/test/CauseMapAnnotations.test.ts that verifies Cause.map preserves annotations on mapped Fail reasons.

The test correctly fails with Service not found: RequestId, confirming the bug. Root cause: causeMap at internal/effect.ts:271 creates new Fail(f(failure.error)) without forwarding failure.annotations.

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[pullfrog]

✅ No new issues found.

Reviewed changes

• Applied fix to causeMap — new Fail(f(failure.error), failure.annotations) now forwards annotations instead of dropping them, addressing the root cause identified in the prior review.
• Refined test assertion — changed from Context.get to Context.getOrUndefined per tim-smart's review, a better pattern for this check.
• Removed unnecessary new Map() wrapping — the 43b70d2c fix initially wrapped annotations in new Map(failure.annotations); the 7e6b7d7 commit applied tim-smart's suggestion to pass failure.annotations directly since it already has the expected type.
• Added changeset — patch bump for effect.

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[pullfrog]

✅ No new issues found.

Reviewed changes

• Removed unnecessary new Map() wrapping in causeMap — passes failure.annotations directly to the Fail constructor instead of copying via new Map().
• Added explicit ReadonlyMap type annotation to constEmptyAnnotations — fixes type inference so the Fail constructor parameter is ReadonlyMap<string, unknown> rather than Map<string, unknown>, making it directly compatible with failure.annotations from Cause.Fail reasons.

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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	6.65 KB	6.77 KB	-0.13 KB (-1.86%)
batching.ts	9.44 KB	9.57 KB	-0.13 KB (-1.38%)
brand.ts	6.33 KB	6.45 KB	-0.12 KB (-1.88%)
cache.ts	10.20 KB	10.31 KB	-0.11 KB (-1.11%)
config.ts	20.35 KB	20.47 KB	-0.12 KB (-0.59%)
differ.ts	19.95 KB	20.08 KB	-0.12 KB (-0.62%)
http-client.ts	21.04 KB	21.16 KB	-0.12 KB (-0.58%)
logger.ts	10.35 KB	10.46 KB	-0.12 KB (-1.11%)
metric.ts	8.58 KB	8.70 KB	-0.13 KB (-1.44%)
optic.ts	7.34 KB	7.46 KB	-0.12 KB (-1.59%)
pubsub.ts	14.49 KB	14.60 KB	-0.12 KB (-0.80%)
queue.ts	11.15 KB	11.26 KB	-0.11 KB (-0.99%)
schedule.ts	10.33 KB	10.44 KB	-0.11 KB (-1.05%)
schema-class.ts	18.89 KB	19.01 KB	-0.13 KB (-0.67%)
schema-fromJsonSchemaDocument.ts	28.70 KB	28.81 KB	-0.12 KB (-0.41%)
schema-representation-roundtrip.ts	25.01 KB	25.14 KB	-0.13 KB (-0.50%)
schema-string-transformation.ts	13.01 KB	13.12 KB	-0.11 KB (-0.82%)
schema-string.ts	10.67 KB	10.79 KB	-0.12 KB (-1.08%)
schema-template-literal.ts	14.87 KB	14.99 KB	-0.12 KB (-0.81%)
schema-toArbitraryLazy.ts	21.68 KB	21.80 KB	-0.12 KB (-0.55%)
schema-toCodeDocument.ts	24.10 KB	24.20 KB	-0.10 KB (-0.43%)
schema-toCodecJson.ts	18.94 KB	19.05 KB	-0.12 KB (-0.61%)
schema-toEquivalence.ts	18.74 KB	18.88 KB	-0.13 KB (-0.70%)
schema-toFormatter.ts	18.61 KB	18.74 KB	-0.13 KB (-0.68%)
schema-toJsonSchemaDocument.ts	22.36 KB	22.49 KB	-0.13 KB (-0.59%)
schema-toRepresentation.ts	19.28 KB	19.41 KB	-0.13 KB (-0.64%)
schema.ts	18.14 KB	18.26 KB	-0.12 KB (-0.67%)
stm.ts	12.13 KB	12.25 KB	-0.12 KB (-0.96%)
stream.ts	9.38 KB	9.49 KB	-0.11 KB (-1.17%)