🎨 Make the default record writing space consistent

[sunnyosun]

Summary

• When creating a typed record without an explicit space, default to the type's _aux.ss single-space policy (1/"1" → type owning space, or an exact space uid).
• Keep existing precedence otherwise: explicit space/space_id > single-space policy > context/settings.space > all.
• Aligns SDK create behavior with the Hub write-space default so callers no longer need to pass the locked space manually (DB triggers still reject explicit mismatches).

Test plan

• Extend test_single_space_enforces_type_space_or_specific_space for auto-default on ss=1 and exact uid
• Keep coverage that wrong explicit space= still fails the Postgres trigger

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.97%. Comparing base (112244e) to head (caaf079).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lamindb/models/sqlrecord.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3844      +/-   ##
==========================================
- Coverage   91.55%   86.97%   -4.58%     
==========================================
  Files          88       88              
  Lines       15747    15765      +18     
==========================================
- Hits        14417    13712     -705     
- Misses       1330     2053     +723     

Files with missing lines	Coverage Δ
lamindb/models/sqlrecord.py	92.02% <89.47%> (-0.05%)	⬇️

... and 15 files with indirect coverage changes

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[github-actions]

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