feat(adk): align stores with ADK 2 contract

[cofin]

Summary

• Align SQLSpec ADK session and memory stores with the ADK 2 scoped contract and current event_data record shape.
• Restore explicit sync-store surfaces for sync-backed adapters and bridge them from SQLSpecSessionService for async ADK callers.
• Add reset migration coverage for recreated ADK tables and update adapter contract tests across Oracle, Postgres, Spanner, SQLite, DuckDB, MySQL-family, and ADBC paths.
• Retire stale duplicate adapter-local ADK CRUD/event tests that were superseded by the shared contract matrix.

Validation

• make lint
• make type-check
• .venv/bin/python -m pytest tests/unit/extensions/test_adk tests/unit/adapters/test_oracledb/test_oracle_adk_store.py tests/unit/adapters/test_psycopg/test_adk_store.py tests/unit/adapters/test_spanner/test_adk_store.py tests/integration/adapters/sqlite/extensions/adk/test_memory_store.py tests/integration/adapters/sqlite/extensions/adk/test_owner_id_column.py tests/integration/adapters/duckdb/extensions/adk/test_memory_store.py tests/integration/adapters/duckdb/extensions/adk/test_store.py tests/integration/adapters/adbc/extensions/adk/test_dialect_support.py tests/integration/adapters/adbc/extensions/adk/test_owner_id_column.py tests/integration/adapters/adbc/extensions/adk/test_memory_store.py -q
• git diff --check
• rg -n "event_json" sqlspec/extensions/adk sqlspec/adapters tests/integration/adapters/*/extensions/adk tests/unit/extensions/test_adk tests/unit/adapters -g '*.py'

[codecov-commenter]

Codecov Report

❌ Patch coverage is 63.04469% with 1323 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.12%. Comparing base (5c375d3) to head (09269e2).

Files with missing lines	Patch %	Lines
sqlspec/adapters/mysqlconnector/adk/store.py	64.81%	122 Missing and 11 partials ⚠️
sqlspec/adapters/psycopg/adk/store.py	62.38%	117 Missing and 9 partials ⚠️
sqlspec/adapters/cockroach_psycopg/adk/store.py	64.58%	110 Missing and 9 partials ⚠️
sqlspec/adapters/adbc/adk/store.py	63.27%	94 Missing and 7 partials ⚠️
sqlspec/adapters/duckdb/adk/store.py	52.91%	88 Missing and 1 partial ⚠️
sqlspec/adapters/psqlpy/adk/store.py	53.80%	74 Missing and 5 partials ⚠️
sqlspec/adapters/pymysql/adk/store.py	74.00%	69 Missing and 9 partials ⚠️
sqlspec/adapters/aiomysql/adk/store.py	63.10%	67 Missing and 9 partials ⚠️
sqlspec/adapters/asyncmy/adk/store.py	64.25%	65 Missing and 9 partials ⚠️
sqlspec/adapters/sqlite/adk/store.py	64.32%	65 Missing and 6 partials ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #525      +/-   ##
==========================================
+ Coverage   74.90%   75.12%   +0.22%     
==========================================
  Files         442      443       +1     
  Lines       55120    57603    +2483     
  Branches     8697     8891     +194     
==========================================
+ Hits        41287    43276    +1989     
- Misses      11149    11523     +374     
- Partials     2684     2804     +120     

Flag	Coverage Δ
integration	59.62% <58.12%> (+0.99%)	⬆️
py3.10	73.45% <63.04%> (+1.66%)	⬆️
py3.11	73.47% <63.04%> (+1.66%)	⬆️
py3.12	73.46% <63.01%> (+1.66%)	⬆️
py3.13	73.46% <63.01%> (+1.67%)	⬆️
py3.14	74.29% <62.93%> (+0.26%)	⬆️
unit	60.48% <28.57%> (-1.44%)	⬇️

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

Files with missing lines	Coverage Δ
sqlspec/adapters/oracledb/adk/store.py	57.80% <ø> (+14.45%)	⬆️
sqlspec/config.py	92.99% <100.00%> (ø)
sqlspec/extensions/adk/_config_utils.py	84.00% <100.00%> (+2.75%)	⬆️
sqlspec/extensions/adk/_types.py	100.00% <100.00%> (ø)
sqlspec/extensions/adk/converters.py	100.00% <100.00%> (ø)
...xtensions/adk/migrations/0001_create_adk_tables.py	0.00% <0.00%> (ø)
sqlspec/extensions/adk/service.py	73.01% <77.19%> (+9.92%)	⬆️
sqlspec/extensions/adk/memory/store.py	71.52% <58.33%> (+0.09%)	⬆️
...extensions/adk/migrations/0002_reset_adk_tables.py	35.93% <35.93%> (ø)
sqlspec/adapters/asyncpg/adk/store.py	56.47% <60.17%> (-2.11%)	⬇️
... and 14 more

... and 4 files with indirect coverage changes

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