Complete KnowledgeDigest full-care and packaging

[lukisch]

Separates the documented local SQLite/FTS workflow from optional provider and synchronization data flows, and narrows security and licensing claims to what the current implementation and reviewed dependency files support. Packaging includes the Qt icon in the wheel and sdist; the sdist carries its linked documentation and explicit manifest. Installed-artifact smoke checks cover both artifacts. Version 0.4.0 is unchanged.

Local verification: 218 tests collected, 213 passed, and 5 optional SQLite Transit tests skipped because that dependency was not installed. All six GUI tests ran. Ruff and diff checks passed; wheel and sdist builds, CLI help, and installed icon smoke checks passed. GitHub CI remains the required merge gate.

Artifacts:

• knowledgedigest-0.4.0-py3-none-any.whl — SHA-256 f4fbdc147a9c77bd8871e0c892340d26b7b8d8eaa60377f6661c967c7bf7ccf5
• knowledgedigest-0.4.0.tar.gz — SHA-256 f6325bc0cd85ff2a22e84bead8c73a457968fb1050f5143e27ded87691aee347

[github-actions]

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[lukisch]

Root review of f3750f8: documentation reconciled with provider/configuration/runtime source; wheel/sdist icon and source-document link targets verified with byte parity. Local clean-source suite 213 passed, 5 optional Transit skips; four required Python CI jobs, package artifact job and CodeQL pass. The non-required welcome action twice failed on GitHub API HTTP 502; no workflow-source fault identified. This external lifecycle failure is retained for follow-up and is not represented as green.