fix(mypyc): isolate compiled async exception state

[cofin]

Closes #702.

Compiled async operations could inherit an exception already being handled by the caller, causing a successful query to re-raise that ambient exception. This isolates affected operations in a fresh asyncio task while preserving async-only exception-handler mapping, pass-through, observability, cache, bulk, script, and streaming behavior across compiled adapters.

Also fixes Oracle guarded-import warnings in the documentation build and prepares the 0.61.1 patch release.

Validated with focused exception/smoke tests, Ruff, mypy, a warnings-as-errors Sphinx build, and the 179-module mypyc smoke.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.27027% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.65%. Comparing base (6a9e478) to head (a618431).

Files with missing lines	Patch %	Lines
sqlspec/driver/_async.py	82.05%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #710   +/-   ##
=======================================
  Coverage   76.64%   76.65%           
=======================================
  Files         488      488           
  Lines       69508    69524   +16     
  Branches     9613     9615    +2     
=======================================
+ Hits        53275    53294   +19     
+ Misses      12803    12800    -3     
  Partials     3430     3430           

Flag	Coverage Δ
integration	60.29% <95.27%> (+0.02%)	⬆️
py3.10	74.92% <95.27%> (+0.02%)	⬆️
py3.11	74.92% <95.27%> (+<0.01%)	⬆️
py3.12	74.92% <95.27%> (+<0.01%)	⬆️
py3.13	74.92% <95.27%> (+0.01%)	⬆️
py3.14	75.84% <95.27%> (+0.01%)	⬆️
unit	64.31% <54.72%> (+0.02%)	⬆️

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

Files with missing lines	Coverage Δ
sqlspec/adapters/aiomysql/core.py	73.68% <100.00%> (-0.09%)	⬇️
sqlspec/adapters/aiosqlite/core.py	80.79% <100.00%> (-0.06%)	⬇️
sqlspec/adapters/asyncmy/core.py	71.67% <100.00%> (-0.10%)	⬇️
sqlspec/adapters/asyncpg/core.py	78.18% <100.00%> (ø)
sqlspec/adapters/mysqlconnector/core.py	75.56% <100.00%> (-0.07%)	⬇️
sqlspec/adapters/oracledb/core.py	77.94% <100.00%> (-0.04%)	⬇️
sqlspec/adapters/psqlpy/core.py	77.03% <100.00%> (-0.05%)	⬇️
sqlspec/adapters/psycopg/core.py	92.43% <100.00%> (-0.03%)	⬇️
sqlspec/driver/_exception_handler.py	93.65% <100.00%> (+3.90%)	⬆️
sqlspec/driver/_async.py	80.66% <82.05%> (-0.04%)	⬇️

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.