test(conformance): restore the 13 retired scenarios once their surfaces are verified #991

Follow-up of #749. Part of #710.

Summary

#749 removed 13 names from the internal conformance matrix (python/tests/conformance/suite.py) because none had a test body. Each one needs a per-adapter surface that still raises _verify.blocked(...), so no adapter can run it yet. This issue tracks bringing each name back, with a body, once its surface is verified and built.

Retired scenarios and what blocks each

The pure logic beneath them (ToolFilter, collision prefixes, governance criteria, content digests) is already unit-tested in tests/unit/test_pure_logic.py.

Steps

• As each surface leaves _verify.blocked(...) (verified against the live platform per the verification discipline), re-add its scenario names to CONFORMANCE_SCENARIOS.
• Add a SCENARIO_BODIES entry pointing at the tests that run each name. test_every_scenario_has_an_executable_body enforces this.
• Add any per-adapter exemption to KNOWN_LIMITATIONS and the README tables. test_readme_exemptions_table.py keeps them in step.

Done when

• Each of the 13 names is either back in the matrix with an executable body, or explicitly dropped here with a reason.

References

• Retired in test(conformance): implement or retire the internal 20-scenario conformance matrix #749 (PR to follow).
• Source: TEST-04 (code review 2026-09-30, at commit 11b806b)

Depends on

• tools: donkey.tools.discover() returns governed MCP tools as native framework tools #221 — donkey.tools.discover() must lift the tools/session.py binding guards before the four tool scenarios can run.
• tools: ToolSet.filter() — allow/deny/predicate filtering and descriptor token accounting #42 — ToolSet.filter() backs tool_filtering.
• Verify the Exchange asset search API and whether wildcard query is server-side #53 — the Exchange asset search API must be verified before registry/exchange.py (and governed_filter_excludes) can unblock.
• scanner: donkey publish registers the manifest with Exchange / Agent Registry #218 — donkey publish lifts the registry/publication.py guards behind the three publication/descriptor scenarios.
• Verify the per-framework descriptor-derivation attributes (live introspection) #1024 — the per-framework descriptor attributes (docs/verified-apis.md §10) must be verified before registry/introspect.py unblocks descriptor_matches_framework, auto_vs_live_agree and asset_type_detection.