docs(matrix): Python zero-config L1 from cachekit 0.23.0 and the key= key shape from 0.24.0 (LAB-10009)

[27Bslash6]

Records two Python behaviour changes in sdk-feature-matrix.md, each cited to the release that carries it and checked against the published wheel.

• Key-prefix shape (caller-supplied key), Python was N/A. It now records the decorator's key= key: {id}-{namespace or default}:{key} from cachekit 0.24.0 (fix(decorators)!: a custom key= key carries the decorated function's identity (LAB-10003) cachekit-py#583), {id} being the first 16 hex characters of blake3 of the function's module.qualname, with no ns: token, so CachekitIO files it in default. 0.23.0 and earlier stored {namespace or default}:{key}.
• Backend auto-detection note and Python architecture notes no longer say that nothing configured falls back to localhost Redis. From cachekit 0.23.0 (fix(decorators)!: with nothing configured, @cache caches in L1 instead of dialling localhost Redis (LAB-10002) cachekit-py#580) a plaintext, non-interop decorator caches in L1 only; encrypted and interop= decorators still fall back. Rust and TypeScript are unchanged.
• Changelog fragment changelog.d/20261019_lab-10009.md.

Wheel runs: cachekit==0.24.0 stores be40b83ab2f49763-default:inv-42 for __main__.fetch (blake3 of __main__.fetch, first 16 hex, is be40b83ab2f49763); cachekit==0.23.0 and 0.24.0 with nothing configured run a bare @cache function once in 20 calls (misses=1, l1_hits=19); 0.22.0 runs it 20 times.

Checked locally: tools/conformance.py check --base origin/main, tools/check-version-floors.py, tools/check-spec-duplication.py and tools/test_changelog_collect.py all pass.

Closes LAB-10009

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Summary by CodeRabbit

• Documentation
  • Clarified how Python caller-supplied cache keys vary between versions.
  • Documented that Python 0.23.0 and later use local-only caching for plaintext decorators when no backend is configured; encrypted and interoperability decorators continue to fall back to localhost Redis.
  • Noted that Rust and TypeScript still require a backend.

Walkthrough

The feature matrix and changelog now document Python key shapes by version and backend-selection behaviour when no backend selector is configured.

Changes

Python SDK behaviour documentation

Layer / File(s)	Summary
Document Python key and backend behaviour sdk-feature-matrix.md, changelog.d/20261019_lab-10009.md	The documentation distinguishes Python key shapes before and from cachekit 0.24.0. It also records the no-selector behaviour from 0.23.0 for plaintext, non-interop decorators, and the fallback retained for encrypted and interop= decorators.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Other

Merge Risk: 🔵 Low · up to 4f1db

Upgrading to Python cachekit 0.24.0 can cause existing custom-key entries to be recomputed. The changelog does not yet mention this temporary cold-cache effect, leaving a small, localized documentation risk.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly summarises the two main documentation changes: Python zero-configuration L1 behaviour from cachekit 0.23.0 and the key= key shape from cachekit 0.24.0.
Description check		The description is directly related to the changeset. It explains the version-specific key shape, backend behaviour, documentation updates, changelog entry, validation steps, and issue closure.
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.

Full details: Docstring Coverage

Explanation

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 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @changelog.d/20261019_lab-10009.md:
- Around line 5-7: Update the changelog entry describing the 0.24.0 `key=`
format to state that existing backend entries written in the earlier format will
be cache misses on upgrade and are repopulated by the next successful call.

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