Log info schema messages at debug level

[maddenp-cu]

Synopsis

Log non-error informational messages about schema validation at debug level.

I have come to find these messages noisy and not very helpful. In uw-aigfs, for example, we will instantiate many drivers as part of a realtime workflow, and even just for a 4-cycle rolling window, we see these log messages:

[2026-10-09T20:44:58]     INFO Schema validation succeeded for aigfs_inference config
[2026-10-09T20:44:58]     INFO Validating config against internal schema: platform
[2026-10-09T20:44:58]     INFO Schema validation succeeded for platform config
[ 86 (!) lines elided ]
[2026-10-09T20:44:59]     INFO Schema validation succeeded for aigfs_post config
[2026-10-09T20:44:59]     INFO Validating config against internal schema: platform
[2026-10-09T20:44:59]     INFO Schema validation succeeded for platform config

This PR shifts these INFO messages to DEBUG and updates docs, notebooks, and tests to match. Error messages related to schema validation are of course still logged at ERROR level.

Type

• Code maintenance (refactoring, etc. without behavior change)
• Documentation
• Tooling (CI, code-quality, packaging, revision-control, etc.)

Impact

• This is a breaking change (changes existing functionality)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.
• Where helpful, I have written comments in this PR's Files changed view to assist reviewers.