chore(conformance): record cachekit-py's encryption 1.5.0, cache-keys 1.3.0 and current python-frame copies (LAB-8295)

[27Bslash6]

Records cachekit-py's three new fixture copies from cachekit-py#561 in conformance/sdks.json, at its merge commit d49b984, and regenerates conformance/coverage.md.

• encryption.json 1.5.0 (first time recorded), cache-keys.json 1.3.0 and the current python-frame.json. Every cachekit-py copy was re-hashed at d49b984 and at py main (3c1ceb0, identical); all nine equal this repo's current fixtures, and only those three changed.
• Coverage for cachekit-py: covered 7 → 12, partial 81 → 86, uncovered 15 → 5. KEY-2, KEY-6 to KEY-9 become covered; the ENC, PRE and KEY requirements the new tables reach move to partial (gap). No other SDK's cell changes.
• Feature matrix, Test vectors in CI cachekit-py cell and note ¹⁶: the three copies (unreleased), and one deviation: two keyring.configuration cases (keyring_current_key_decrypt_only and its uppercase twin, current key given as master_key=) run as strict expected failures naming ENC-9, because cachekit-py refuses the repeated current key only on the first call, not at load. Note ¹⁶ now gives this repo's encryption.json as 1.5.0 and cache-keys.json as 1.3.0, with what each later revision adds.

python3 tools/conformance.py check --base origin/main passes, and tools/test_conformance.py passes all 284 cases with no pin change.

Overlap: #186 (cachekit-rs) and #187 (cachekit-ts) edit the same matrix row, the same note ¹⁶ sentence on encryption.json's version, sdks.json and coverage.md. Each matrix row and note is one line, so whichever of the three lands later rebases: keep every SDK's clauses, take one wording for the 1.5.0 sentence (the three say the same thing), and regenerate coverage.md. The cachekit-ts and cachekit-rs claims on main that their main has since overtaken (ts encryption.json 1.3.0, rs python-frame.json) are left to those two PRs.

Closes LAB-8295

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Summary by CodeRabbit

• Documentation
  • Updated conformance coverage records across Python, TypeScript and Rust for cache keys, encryption, intent presets and interoperability, including revised coverage statuses and known gaps.
  • Refreshed the SDK feature matrix to reflect current test-vector coverage, fixture versions and expected failures in two Python keyring cases.
  • Updated the recorded Python SDK revision and fixture inventory.

Walkthrough

The pull request records cachekit-py revision d49b984, updates fixture hashes and conformance coverage statuses, and documents the fixture versions and two keyring.configuration expected failures.

Changes

Python conformance vectors

Layer / File(s)	Summary
Record vector revisions and conformance coverage conformance/sdks.json, conformance/coverage.md, sdk-feature-matrix.md, changelog.d/20261009_lab-8295.md	The SDK entry records revision d49b984 and updated fixture hashes. Coverage statuses change for cache-key, encryption, intent-preset, and interop requirements. The feature matrix and changelog record the fixture versions and two keyring.configuration expected failures.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 0650b

No actionable merge-blocking risk remains in the reviewed changes.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly identifies the main change: recording cachekit-py's encryption, cache-keys and python-frame fixture copies. It is specific and related to the changeset.
Description check		The description directly explains the fixture updates, coverage changes, feature matrix changes, validation results and overlapping pull requests.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @changelog.d/20261009_lab-8295.md:
- Line 3: Update the four repository-root links in the changelog
entry—conformance/sdks.json, conformance/coverage.md, sdk-feature-matrix.md, and
spec/encryption.md—to use paths prefixed with ../ so they resolve correctly from
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