[ancongui]

Installed wheels currently resolve alembic.ini relative to site-packages, so flycanon migrate misses the reviewed scaffold in the operator's working directory. Select ./alembic.ini explicitly and reject a missing or non-file configuration before migration starts. Keep FLYCANON_DATABASE_URL, upgrade head, wheel contents, migrations, and serve behavior unchanged.

Add three regression cases for a wheel-style module location, missing configuration with a valid parent configuration, and a directory named alembic.ini. Update installation/CLI guidance, document the direct Alembic workaround for retained 26.10.4 installations, and align existing server/SDK version metadata for proposed 26.10.5. No release or tag is created by this PR.

The concurrency test module uses a temporary file-backed SQLite database so concurrent AsyncSessions receive independent connections. Two causal controls cover distinct DBAPI identities and rollback isolation. All 31 original concurrency test functions retain identical ASTs; global unit fixtures and production transaction code are unchanged. The OpenAPI snapshot changes only info.version to match the release metadata.

Validation:

• TDD: all three new tests failed against the prior implementation, then passed; all 28 CLI tests pass.
• Ruff lint and format: 407 files pass.
• Python SDK: 61 tests pass with source-declared version metadata in an isolated test overlay. The retained installed SDK remains 26.10.4; this is source-suite evidence, not installed 26.10.5 artifact qualification.
• Java SDK: offline Maven verification passes, 62 tests.
• Concurrency fixture TDD: both causal controls failed with the original shared in-memory connection. An observer saw uncommitted data and its rollback erased another writer's insert. With independent connections, all 33 module tests pass.
• Final full server unit suite: 1,219 passed, 5 skipped, with 31 warnings, on one run after the fixture correction. Initial evidence remains retained: 1,215 passed, 5 skipped, and failures in TestKnowledgeRetireServiceConcurrency::test_concurrent_retire_one_winner and TestKnowledgeVersionConflictServiceConcurrency::test_concurrent_update_one_typed_conflict. The update-history failure also reproduced against the unchanged installed public 26.10.4 package. This test-fixture correction does not qualify PostgreSQL transactions.
• Configured Pyright check is unavailable locally because the retained checker lacks its bundled standard-library stubs. A diagnostic with other retained stubs is not counted as configured qualification.

Independent review preserved all 31 original concurrency-test ASTs and reran all three CLI plus 33 concurrency cases successfully. Current-head hosted CI passes all seven jobs: server units, native integration, Python SDK, Java SDK, lint, advisory type checking, and Docker build smoke. The SDK lockfile is aligned with 26.10.5; no dependency versions changed.

New installed-CLI migration observation and public release artifact/tag verification remain separate. The retained 26.10.4 knowledge environment is unchanged and uses its documented Alembic workaround.