[shnapz]

• Fix ambiguous implicit in IcebergIOIT — exclude rfLocalDateTimeMicros from the timestamp.micros wildcard import since IcebergIO needs SqlTypes.DATETIME (millis grouping) for unzoned timestamps, not raw INT64
• Add integration/Test/compile to the CI build postamble so integration test compilation errors are caught on PR builds, not only after merge to main

Context

After merging #6000 (magnolify 0.9.8 + timestamp.micros._), CI failed on main with an ambiguous implicit: the wildcard import timestamp.micros._ brings rfLocalDateTimeMicros (raw INT64) into scope alongside the explicit localDateTimeRowField (SqlTypes.DATETIME) in the companion object. Both provide RowField[LocalDateTime].

The root cause is an axis mismatch: magnolify groups implicits by precision (millis/micros/nanos), but IcebergIO consumes by logical type — Instant needs Timestamp.MICROS (from micros) while LocalDateTime needs SqlTypes.DATETIME (from millis). A single wildcard import can't serve both.

This wasn't caught on the PR because integration test compilation was only running on main, not on PRs.

Changes

1. IcebergIOIT.scala — exclude rfLocalDateTimeMicros from the wildcard import; added comment explaining the precision/logical-type mismatch
2. build.sbt — add integration/Test/compile to githubWorkflowBuildPostamble
3. .github/workflows/ci.yml — regenerated (adds "Compile integration tests" step to all build matrix entries)

Test plan

• IcebergIOIT passes locally (both tests, full Iceberg REST catalog round-trip)
• CI green on PR (including the new integration compile step)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.99%. Comparing base (7216c31) to head (3ed6e93).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6001   +/-   ##
=======================================
  Coverage   61.99%   61.99%           
=======================================
  Files         323      323           
  Lines       11743    11743           
  Branches      839      839           
=======================================
  Hits         7280     7280           
  Misses       4463     4463           

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