feat(mssql): align extension stores and document SQL Server workflows

[cofin]

Adds MssqlPythonADKMemoryStore and SQL Server coverage in shared ADK, event-queue, and Litestar session-store contracts. An additive ADK migration provisions missing memory tables/indexes for existing mssql-python installations and preserves memory data on downgrade. Memory inserts deduplicate concurrent event IDs atomically.

Fixes session-store parameter/binary handling and unsupported queue lock hints. mssql-python ADK JSON storage defaults to NVARCHAR(MAX), retaining an explicit native_json=True override. Adds SQL Server recipes, driver/store documentation corrections, regression coverage, and v0.63.0 release notes.

Validation: make lint passed during review. Regression tests were added or updated, but no local test suite was run in this review. Hosted CI for the latest branch head is still pending.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.69421% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.73%. Comparing base (8547d5d) to head (6afce6c).

Files with missing lines	Patch %	Lines
sqlspec/adapters/mssql_python/adk/store.py	95.50%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #781      +/-   ##
==========================================
+ Coverage   76.96%   78.73%   +1.76%     
==========================================
  Files         487      488       +1     
  Lines       71929    72018      +89     
  Branches    10075    10089      +14     
==========================================
+ Hits        55361    56704    +1343     
+ Misses      13149    11827    -1322     
- Partials     3419     3487      +68     

Flag	Coverage Δ
integration	62.33% <80.16%> (+3.46%)	⬆️
py3.10	76.85% <90.90%> (+0.40%)	⬆️
py3.11	76.86% <90.90%> (+10.27%)	⬆️
py3.12	66.60% <53.71%> (-9.86%)	⬇️
py3.13	66.60% <53.71%> (+0.01%)	⬆️
py3.14	77.99% <95.04%> (+11.86%)	⬆️
unit	66.94% <53.71%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sqlspec/adapters/mssql_python/adk/__init__.py	100.00% <100.00%> (ø)
sqlspec/adapters/mssql_python/litestar/store.py	82.43% <100.00%> (+29.05%)	⬆️
sqlspec/adapters/pymssql/adk/store.py	71.02% <100.00%> (+35.62%)	⬆️
sqlspec/adapters/pymssql/config.py	96.62% <100.00%> (+1.12%)	⬆️
sqlspec/adapters/pymssql/litestar/store.py	79.72% <ø> (+57.43%)	⬆️
sqlspec/builder/_ddl.py	68.61% <100.00%> (+0.14%)	⬆️
.../adk/migrations/0002_create_mssql_python_memory.py	100.00% <100.00%> (ø)
sqlspec/adapters/mssql_python/adk/store.py	79.60% <95.50%> (+33.74%)	⬆️

... and 48 files with indirect coverage changes

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