docs(ingester): explicit plaintext intent is required by cachekit 0.21 (LAB-7609)

[27Bslash6]

cachekit 0.21.0 removed presence-based encryption activation. With CACHEKIT_MASTER_KEY in the environment, a cache that states no encryption intent now raises ConfigurationError at decoration (cachekit-io/cachekit-py#411). The comment on _no_encryption() described encryption=EncryptionConfig(enabled=False) as a guard against auto-activation; it is now required, and the comment says so along with why the aggregates and checkpoint must stay plaintext.

Merge after #7, which moves the pins this PR's docs name (cachekit 0.21.0, @cachekit-io/cachekit 0.1.5). cachekit-rs is not in that group and stays at 0.7.0.

Changes

• ingester/src/skyline_ingester/publisher.py: _no_encryption() comment rewritten for 0.21.0 semantics.
• ingester/tests/test_publisher.py: the plaintext-with-key test docstring no longer describes auto-activation.
• docs/architecture.md, README.md: pinned versions follow the first-party group; the .op.apikey.env note states the 0.21.0 rule.

Interop key check for 0.21.0

0.21.0 hashes str/int/float/bytes subclass arguments as their base value (cachekit-io/cachekit-py#384). The ingester's interop keys do not move, because the only argument to every interop publish is a plain str: __main__.py iterates the keys of the dict literal WINDOW_TTLS = {"5m": 60, "1h": 300, "24h": 900} (windows.py) and passes each to Publisher.publish_window(window), which hands it unchanged to fn(window) in _refresh. No subclass is constructed anywhere on that path. The namespace bluesky-thinking and the five operation names contain no .., so the 0.21.0 segment check (cachekit-io/cachekit-py#391) does not fire either.

Testing

• uv run pytest -q in ingester/ (cachekit 0.15.0, current lock): 191 passed.
• uv run --with cachekit==0.21.0 pytest -q in ingester/: 191 passed, including test_byte_locked_vectors (the 3-way interop vectors) and test_interop_values_stay_plaintext_with_master_key_in_env.
• On 0.21.0 with CACHEKIT_MASTER_KEY set, an interop @cache with encryption= omitted raises ConfigurationError; the same cache with encryption=False publishes plaintext.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated architecture references to show the current versions of the Python ingester and TypeScript SDK.
  • Clarified that caches must explicitly declare encryption intent when CACHEKIT_MASTER_KEY is set.
  • Updated guidance on plaintext aggregates and checkpoints that must remain readable across hosts.

Walkthrough

Version references and encryption configuration comments were updated in the README, architecture documentation, publisher, and publisher test. The comments describe cachekit’s encryption configuration requirement and retain details about plaintext MessagePack aggregates and cross-host checkpoints.

Changes

Cachekit version and encryption configuration

Layer / File(s)	Summary
Update version and encryption configuration notes README.md, docs/architecture.md, ingester/src/skyline_ingester/publisher.py, ingester/tests/test_publisher.py	The documented Python and TypeScript SDK versions were updated. The API-key-only environment-file note and publisher comments now describe the cachekit 0.21.0 encryption configuration requirement when a master key is present. The comments retain the plaintext MessagePack interop and cross-host checkpoint details.

Priority: ➖ Normal

Change: Other

Merge Risk: 🔵 Low · up to 2b055

The version documentation misstates what this repository uses. Correct it before relying on the stated versions; the mismatch does not itself block the documented workflows.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title follows conventional commit syntax and describes the cachekit 0.21 plaintext-intent change. It exceeds the preferred 50-character length, but that limit is advisory.
Description check	✅ Passed	The description explains the cachekit 0.21 behaviour, the documentation and comment updates, and the reported test results. It is relevant to the changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1 unsupported.)

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- docs/architecture.md:12

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### [1/1] docs/architecture.md:12
Issue identified during code review:
Version mismatch in the docs/architecture.md components table: the 'Pinned version' column lists cachekit 0.21.0, @cachekit-io/cachekit 0.1.5, and cachekit-rs 0.9.0, but the real pins are still cachekit==0.15.0 (ingester/pyproject.toml:9, uv.lock:676), @cachekit-io/cachekit 0.1.3 (edge/package.json:18), and cachekit-rs 0.7.0 (hotpath/Cargo.toml:20,37). The README diagram (line 38) has the same mismatch. Because the deployed ingester runs cachekit 0.15.0, the 0.21 ConfigurationError described in the new publisher.py comment and test docstring is never checked. Fix: bump the pins in ingester/pyproject.toml, uv.lock, edge/package.json, and hotpath/Cargo.toml in this PR, or revert the docs to the versions actually pinned.
Reference implementation (from code review):

// docs/architecture.md:12
# ingester/pyproject.toml
    "cachekit==0.21.0",
# edge/package.json
    "@cachekit-io/cachekit": "0.1.5"
# hotpath/Cargo.toml
cachekit-rs = { version = "0.9.0", default-features = false }

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Inline comments:
Review comments at @ingester/src/skyline_ingester/publisher.py:
- Around line 37-38: Update the comments in
ingester/src/skyline_ingester/publisher.py at lines 37-38, docs/architecture.md
at line 135, and ingester/tests/test_publisher.py at lines 41-42 to clarify that
ConfigurationError occurs when a cache omits the encryption= argument; do not
imply that explicitly setting EncryptionConfig(enabled=False) triggers the
error.

Review comments at @README.md:
- Line 38: Update the Python and Rust version labels in the README architecture
diagram and all version entries in the architecture table to match the versions
selected by their dependency lockfiles; keep the already-correct TypeScript
diagram label unchanged, but correct the TypeScript table version to match its
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