docs: annotate Python TTL cells with the open fix cachekit-py#318 (LAB-4641)

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Summary

Documentation-only change that annotates the two Python non-conformance cells related to default TTL semantics with the in-flight remediation in cachekit-py#318, without altering their current status.

Changes

spec/intent-presets.md — SDK Conformance table

• Finite default TTL (300 / 600 / 600 / 3 600 s): the Python cell remains ❌ but is now scoped to "through 0.19.0" and records the proposed implementation shape — preset defaults applied via kwargs.setdefault("ttl", …) in DecoratorConfig, with ttl=None retained as an explicit opt-in to non-expiring entries.
• No process-wide default-TTL override (rule 3): the Python cell now notes that the open PR removes the default_ttl, ttl_min, and ttl_max configuration surface.
• Both cells carry an explicit flip condition: ✅ only once a PyPI release ships the change.

sdk-feature-matrix.md

• Preset TTL defaults row: the "entries never expire" claim is version-bounded to 0.19.0 and linked to the open fix.
• Parity-trap warning: adds that cachekit-py#318 adopts the same four TTL defaults already used by Rust and TypeScript.
• Footnote ¹⁰ (client-L1 SWR): clarifies that the "no default TTL ⇒ no SWR" consequence holds through 0.19.0, since the pending change would supply preset defaults and thereby satisfy the ttl is not None and ttl > 0 precondition in _l1_swr_active.

Rationale

Per rule 3 of decisions/matrix-version-verification.md, a merged PR does not constitute a shipped feature. The status markers are intentionally unchanged; the annotations exist so the tables disclose known in-flight work rather than presenting the current behavior as settled. No specification requirements, public APIs, or conformance verdicts are modified.

Refs LAB-4641

---

Summary

Documentation-only change adding verification provenance to the Python TTL parity claims across the feature matrix and intent-preset specification.

Changes

sdk-feature-matrix.md

• Appended the qualifier "PyPI wheel inspected 2026-09-24" to three assertions that Python presets ship no default TTL through 0.19.0: the client-L1 SWR footnote (¹⁰), the "Preset TTL defaults" row of the intent-preset semantics table, and the parity warning callout.

spec/intent-presets.md

• Added the same inspection date to the "Finite default TTL" conformance row.
• Added both the version bound ("through 0.19.0") and the inspection date to the "No process-wide default-TTL override (rule 3)" conformance row, which previously carried neither.

Notes

No behavioral or API changes. Existing references to the open fix (cachekit-py#318) and the conditions under which the cells flip to ✅ remain unchanged; the edits only record when the upstream artifact was last verified, making the non-conformance claims auditable against a specific published wheel.

---

Summary

Documentation-only update to the SDK feature matrix and intent-preset specification, clarifying the status of the open Python default-TTL fix (cachekit-py#318, LAB-4641).

Changes

sdk-feature-matrix.md

• Scoped the Python client-L1 SWR cell to "through 0.19.0" and documented the linkage between the preset-TTL fix and SWR availability: because _l1_swr_active requires a non-None TTL, the preset TTLs introduced by cachekit-py#318 will satisfy that condition for the presets that already enable L1 SWR (production, secure, dev), so the Python SWR cell flips in the same release as the preset-TTL row.
• Corrected the decorators/wrapper.py line reference for _l1_swr_active (666 → 686).
• Restated the "Preset TTL defaults" cell to note it will flip to a version floor alongside the SWR row once a PyPI release carries the fix.
• Removed duplicated verification metadata and PR links from the adjacent warning callout.

spec/intent-presets.md

• Added a note to the conformance table preamble recording that both Python default-TTL rows were re-verified against the PyPI 0.19.0 wheel on 2026-09-24 (unchanged) and will flip to ✅ with a version floor once released.
• Condensed the "Finite default TTL" and "No process-wide default-TTL override" rows by moving the shared verification detail into the preamble.

No specification requirements, conformance verdicts, or public API surfaces were altered.

---

Summary

This PR corrects footnote ¹⁰ in sdk-feature-matrix.md, which covers Python client-L1 stale-while-revalidate (SWR) and its dependence on the preset default TTLs introduced in cachekit-py#318.

Change

• Before: The footnote said cachekit-py#318's preset TTLs would activate L1 SWR for production, secure, and dev.
• After: The footnote lists only production and dev. It explains that secure sets swr_enabled but refuses backend=None. As a result, secure never runs in L1-only mode, which _l1_swr_active requires.

The rest of the footnote is unchanged. That includes the _l1_swr_active condition, the Rust SWR description, and the note on the unused L1Cache.get_with_swr.

Impact

• Documentation only. No code, spec, or public API changes.
• The matrix no longer implies that the secure preset will gain L1 SWR when cachekit-py#318 ships.

---

This PR corrects footnote ¹⁰ (Client-L1 SWR) in sdk-feature-matrix.md. It is a documentation-only change: no code or public APIs are modified.

Changes

The footnote previously said the Python secure preset refuses backend=None and therefore never reaches the L1-only SWR path. That was stated as current behavior. The revised text says:

• secure also sets swr_enabled. The backend=None refusal comes from cachekit-py#322 (LAB-4665), which is merged to main but not yet published to PyPI.
• Every release that includes cachekit-py#318 (preset TTLs) also includes #322. The SWR analysis for secure therefore holds for any release where the preset-TTL change applies.
• Until such a release ships, the 0.19.0 plaintext-in-L1 gap described in the Intent-preset semantics section still applies.

The rest of the footnote is unchanged. This includes the _l1_swr_active condition, the scope to production and dev, and the statement that the Python SWR cell changes in the same release as the preset-TTL row.

Referenced APIs (documentation only)

• Python secure preset: its swr_enabled setting and its handling of backend=None
• _l1_swr_active in decorators/wrapper.py

Summary by CodeRabbit

• Documentation
  • Clarified that Python’s stale-while-revalidate and default-TTL limitations apply through version 0.19.0.
  • Updated the compatibility notes to explain that preset TTLs in a future release would meet the stated stale-while-revalidate requirements for applicable presets.
  • Clarified that the specification does not define implementation details, and that Python’s default-TTL findings were rechecked against version 0.19.0.

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Walkthrough

The feature matrix and conformance table now qualify Python TTL findings as applying through version 0.19.0. They also describe proposed fixes and link related findings.

Changes

Python TTL documentation

Layer / File(s)	Summary
Qualify Python TTL findings sdk-feature-matrix.md, spec/intent-presets.md	The feature matrix qualifies Python SWR and preset TTL behaviour through version 0.19.0. The conformance table records the PyPI 0.19.0 recheck and links the Python and Rust TTL findings to fixes.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: 🔵 Low · up to 2fdd9

The matrix overstates future SWR support for the Python secure preset. Remove it from that claim before merging so the documented conformance status is accurate.

Architecture Summary

Architecture risk: 🔵 Low · up to 2fdd9

The change affects 2 systems.

Changed systems: sdk-feature-matrix.md, spec

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — sdk-feature-matrix.md (service) was modified; 1 changed file maps to changed impact.
• observed — spec (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in sdk-feature-matrix.md: The Python SWR cell now qualifies the explicit-TTL limitation as applying through 0.19.0; the Rust, TypeScript and PHP entries are unchanged.
• observed — Modified behavior in sdk-feature-matrix.md: The SWR note now dates Python’s no-default-TTL condition through 0.19.0, cites the proposed preset-TTL change, and states that presets already enabling L1 SWR would then satisfy the stated activation condition. It also updates the referenced source line for _l1_swr_active.
• observed — Modified behavior in sdk-feature-matrix.md: The Python preset-TTL cell now limits the no-expiry claim to releases through 0.19.0 and links the proposed fix; Rust and TypeScript defaults are unchanged.
• observed — Modified behavior in sdk-feature-matrix.md: The warning now qualifies Python’s non-expiring preset entries as applying through 0.19.0; the master-key format, environment-variable behaviour and missing-key outcomes are unchanged.

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✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main documentation change: annotating Python TTL entries with the open fix cachekit-py#318. It is concise and includes the related tracking issue.
Docstring Coverage	✅ Passed	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…
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A code review identified the following issues in this pull request.
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Files involved:
- spec/intent-presets.md:409

---

### [1/1] spec/intent-presets.md:409
Issue identified during code review:
Version bound in spec/intent-presets.md: the qualifier scopes the ❌ cells to 0.19.0, a release that does not appear in the repo's provenance records (spec/intent-presets.md:402 cites cachekit-py@2f7c979 (0.18.0), and sdk-feature-matrix.md:79 records 0.18.0 as the PyPI artifact inspected 2026-09-22). When a version is never opened or published, asserting its state violates decisions/matrix-version-verification.md rules 1 and 5 on bidirectional trust. Bound the claim to the artifact actually inspected by changing all four cells (spec/intent-presets.md:408, :409 and sdk-feature-matrix.md:184, :245, :255) to '0.18.0 (PyPI artifact inspected 2026-09-22)'.
Reference implementation (from code review):

// spec/intent-presets.md:409
| Finite default TTL 300 / 600 / 600 / 3 600 s | ❌ none — entries never expire (`wrapper.py:499`) as of 0.18.0 (PyPI artifact inspected 2026-09-22) — LAB-4641; fix open in [cachekit-py#318](https://github.com/cachekit-io/cachekit-py/pull/318) (`DecoratorConfig` presets `kwargs.setdefault("ttl", …)`, `ttl=None` = explicit opt-in); flips ✅ when a PyPI release carries it | ✅ `intents.rs:76,117,167,217` | ✅ `intents-core.ts:220,242,265,297` |

---

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In @sdk-feature-matrix.md:
- Line 184: Update the Python SWR claim in the sentence referencing
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