fix: flatten stacked readiness, audit, and K9 fixes

[hyperpolymath]

Summary

Flatten the final combined tree of the readiness, dependency-audit, and K9-retirement stack onto current main. This direct-to-main PR avoids the GitHub stacked-PR base restriction that blocked retargeting the first child.

• Clear the remaining Rust lint/readiness diagnostics fixes and update docs references.
• Carry the dependency lockfile/advisory updates and workflow lock changes.
• Retire the K9iser manifest and generated outputs as intended.
• Preserve the final combined tree from the previous stack tip (chore(k9): retire the k9iser output and manifest #223), without carrying its stale branch ancestry.

This supersedes the stacked series #220–#223 if this PR passes review and CI.

Validation

• git diff --check — passed.
• cargo test --all-targets — not run locally; this environment has no cargo executable. Use the PR CI result as the test gate.
• No merge performed; await full CI and review.

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-10-20T00:58:12.075921Z	869be0a	PR opened

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📥 Commits

Reviewing files that changed from the base of the PR and between 5c5dddb and 869be0a.

⛔ Files ignored due to path filters: 4

• .github/workflows/actions.lock is excluded by !**/*.lock
• Cargo.lock is excluded by !**/*.lock
• generated/k9iser/cargo-manifest.k9 is excluded by !**/generated/**
• generated/k9iser/container-build.k9 is excluded by !**/generated/**

📒 Files selected for processing: 16

• .github/workflows/chapel-ci.yml
• .github/workflows/dogfood-gate.yml
• .github/workflows/scorecard.yml
• README.adoc
• k9iser.toml
• src/aggregate/proven_tests.rs
• src/assail/analyzer.rs
• src/assail/mod.rs
• src/bridge/mod.rs
• src/bridge/registry.rs
• src/diagnostics.rs
• src/main.rs
• src/report/gui.rs
• src/safe_path.rs
• src/scan/cargodeny.rs
• src/storage/mod.rs

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