[tim-smart]

Summary

Refresh migration guidance for three changes in the 88 main commits since the previous maintenance run:

• Restore Bedrock guidance now that the provider is available again. Cover client HTTP/crypto dependencies, provider metadata, schema-class replacements and removed helpers.
• Explain how optional or undefined Match.tags / Match.discriminators handlers affect exhaustiveness.
• Document the missing file_id default in six Anthropic citation codecs.

Regenerate migration/v3-to-v4.md. No changeset: documentation only. Previous maintenance PR #10498 is merged.

Validation

• Baseline: 175113ea18f412ec3199e8710ad773b0c081289e (EFF-3549). Checked main: 3ec2199688bc2d3c5d85fce5132cc3d1eb4a1663.
• Generation, lint-fix and diff whitespace checks pass.
• 148 runtime tests pass across Match, Anthropic and Bedrock. Match type tests pass (44 tests / 104 assertions across two targets).
• Full api-diff regression check still reports 19 pre-existing API groups and 0 modules. No new missing IDs versus the baseline check; no Bedrock TODOs remain.
• api-diff --output hit RangeError: Invalid string length while serializing the full head snapshot. Generation and checks without --output succeeded in computing the diff; review stayed limited to recent-commit candidates.

Closes EFF-3705

[changeset-bot]

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Latest commit: 79f52b1

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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
arbitrary-combinators.ts	39.88 KB	39.88 KB	0.00 KB (0.00%)
basic.ts	7.31 KB	7.31 KB	0.00 KB (0.00%)
batching.ts	11.21 KB	11.21 KB	0.00 KB (0.00%)
brand.ts	7.00 KB	7.00 KB	0.00 KB (0.00%)
cache.ts	11.73 KB	11.73 KB	0.00 KB (0.00%)
config.ts	23.09 KB	23.09 KB	0.00 KB (0.00%)
differ.ts	22.20 KB	22.20 KB	0.00 KB (0.00%)
http-client.ts	27.44 KB	27.44 KB	0.00 KB (0.00%)
http-router.ts	37.35 KB	37.35 KB	0.00 KB (0.00%)
logger.ts	12.19 KB	12.19 KB	0.00 KB (0.00%)
metric.ts	9.64 KB	9.64 KB	0.00 KB (0.00%)
optic.ts	7.21 KB	7.21 KB	0.00 KB (0.00%)
pubsub.ts	16.21 KB	16.21 KB	0.00 KB (0.00%)
queue.ts	13.09 KB	13.09 KB	0.00 KB (0.00%)
schedule.ts	11.99 KB	11.99 KB	0.00 KB (0.00%)
schema-bigdecimal.ts	14.29 KB	14.29 KB	0.00 KB (0.00%)
schema-binary.ts	42.45 KB	42.45 KB	0.00 KB (0.00%)
schema-class.ts	21.96 KB	21.96 KB	0.00 KB (0.00%)
schema-fromJsonSchemaDocument.ts	30.56 KB	30.56 KB	0.00 KB (0.00%)
schema-representation-roundtrip.ts	28.26 KB	28.26 KB	0.00 KB (0.00%)
schema-string-transformation.ts	15.54 KB	15.54 KB	0.00 KB (0.00%)
schema-string.ts	12.50 KB	12.50 KB	0.00 KB (0.00%)
schema-template-literal.ts	16.43 KB	16.43 KB	0.00 KB (0.00%)
schema-toArbitrary.ts	39.41 KB	39.41 KB	0.00 KB (0.00%)
schema-toCodeDocument.ts	26.39 KB	26.39 KB	0.00 KB (0.00%)
schema-toCodecJson.ts	21.11 KB	21.11 KB	0.00 KB (0.00%)
schema-toEquivalence.ts	21.28 KB	21.28 KB	0.00 KB (0.00%)
schema-toFormatter.ts	21.37 KB	21.37 KB	0.00 KB (0.00%)
schema-toJsonSchemaDocument.ts	26.42 KB	26.42 KB	0.00 KB (0.00%)
schema-toRepresentation.ts	21.45 KB	21.45 KB	0.00 KB (0.00%)
schema.ts	21.05 KB	21.05 KB	0.00 KB (0.00%)
stm.ts	14.40 KB	14.40 KB	0.00 KB (0.00%)
stream.ts	10.56 KB	10.56 KB	0.00 KB (0.00%)