chore: update vendored Effect source

[pullfrog]

Updates the vendored Effect source tree at repos/effect/ to match upstream main.

Changes: 50 files, ~6.8K insertions, ~4.3K deletions. Includes fixes and new features from the Effect-TS/effect repository.

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[pullfrog]

Diagnosis: CI failure is pre-existing and unrelated to this PR. The Build step fails because elm-pages build in apps/docs tries to fetch lamdera/codecs/1.0.0/elm.json from static.lamdera.com and gets a ResponseTimeout — the Lamdera package registry is unreachable from this CI runner. No files were changed by this PR (diff is empty after the vendored source sync to main), so no fix is applicable here.

Task list (4/7 completed)

• Checkout PR branch
• Fetch check suite logs to diagnose failure
• Verify failure was introduced by this PR
• Diagnose and fix the issue
• Verify fix with pnpm test and pnpm lint
• Commit and push changes
• Report progress

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[pullfrog]

No upstream changes since last sync — the vendored Effect source is already current. Closing without action.

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