* test(python): exercise installed wheels as black boxes
Add an installed-wheel mode that refuses source/editable imports, repository working directories, mismatched SDK/runtime versions, unpinned runtime dependencies, and executables outside the installed runtime distribution. The mode resolves the wheel-owned executable itself, so callers cannot accidentally prove an explicit checkout artifact.
Add a real-API scenario that drives two tool-using turns through the public synchronous SDK, verifies the file bytes outside the agent, checks completed turn/tool events and persistence, and projects provider failures without retaining credential-bearing error text. The existing deterministic scenario set remains the keyless behavior oracle.
Refs #2952.
* ci(python): require installed-wheel checks on every release target
Move the complete deterministic runtime scenarios behind construction and clean installation of the SDK and matching runtime wheels. Each native leg runs outside the checkout with source-resolution environment variables removed; Linux manylinux smokes assert the same installed provenance.
Expand the required pull-request call from Linux x64 to Linux x64, Linux arm64, and macOS arm64. Trusted heads receive only DEEPSEEK_API_KEY_EXTERNAL for a fail-loud live two-turn smoke on each carrier, while fork and Dependabot heads retain the full keyless path without exposing secrets.
Pin the reusable secret declaration, matrix call, aggregate dependency, untrusted-head condition, and live/keyless commands in the workflow contract test.
Refs #2952.
* docs(testing): make installed wheels the Python CI authority
Record the clean-wheel provenance boundary, complete keyless scenario set, trusted real-API contract, secret handling, and three-target required topology in a new implemented testing decision. Update the SEA distribution and portable-CI authorities plus the Python contributor reference to describe the same current state.
Archive the fully superseded Linux-x64-only decision after consolidating its rationale and alternatives into the new owner. Preserve its bilingual triplet as a sealed historical snapshot and redirect every active current-state reference.
Refs #2952.
3c1c6a89b1