perf: avoid discarded core relation hash during workflow registration

[TonisOrmisson]

Summary

• Avoid the full streaming relation-snapshot hash during core transformation registration; registration only needs the parent schema/lineage and never stores that hash.
• Preserve early physical relation/column/ordinal validation with a qualified zero-row projection query.
• Keep derived-parent integrity verification and all execution-time input hashes unchanged.

Evidence

Fresh SQLite registration workload, Python 3.13.2 / SQLite 3.47.1, five repetitions per size (workflow catalog setup excluded):

parent rows	baseline median	candidate median	change
50,000	0.466701 s	0.050539 s	-89.2% / 9.2x
100,000	0.907442 s	0.058390 s	-93.6% / 15.5x

SQLAlchemy execute count remains 139; relation hash calls change from 1 to 0 during registration.

Checks

• 414 passed, 9 skipped, 53 deselected
• git diff --check
• Local read-only review: no findings

No public API, dependency, dataset identity, or persistence model changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between 40466ea and 5eed10e.

📒 Files selected for processing (2)

• src/openstatspec/sql/workflow.py
• tests/test_sql_workflow.py

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