Sweep 2026-07-27: refresh ant-client stamps (2498915b → 5cec8579)

[JimCollinson]

Metadata-only stamp refresh for the daily upstream sweep. No prose changed.

Upstream: ant-client: 2498915b → 5cec8579 (main, PR #159 rc-2026.7.3).

Source artifacts inspected: Cargo.lock, ant-cli/Cargo.toml, ant-core/Cargo.toml, ant-core/tests/support/mod.rs (the complete SHA range), plus a targeted re-grep of the ant-cli/ant-core tree at the head SHA to confirm no CLI or library surface moved.

Developer-facing change: Internal refactor / release-candidate bump; no developer-facing impact. The range is a version bump (ant-cli 0.3.0→0.3.1, ant-core 0.4.0→0.5.0, ant-node dependency 0.14.3→0.15.0) plus a test-only harness change that adds PriceFloorConfig::default() in shadow mode (enforce: false) so node admissions behave unchanged. PriceFloorConfig is a test-support symbol; it is not referenced by any docs page or by SKILL.md, and no price-floor prose exists in the docs set. No public CLI command, flag, --help surface, or Rust library type changed.

Files changed in this PR:

• 19 docs pages — source_commit and verified_date refreshed in the ant-client verification block only (non-ant-client blocks left byte-identical):
  • docs/architecture/system-overview.md, docs/index.md, docs/reference/glossary.md, docs/reference/source-repositories.md
  • docs/cli/command-reference.md, docs/cli/use-the-cli.md
  • docs/core-concepts/{overview,data-types,keys-addresses-and-datamaps,payment-model}.md
  • docs/guides/{overview,build-read-only-features,deploy-to-mainnet,prepare-a-wallet-for-uploads,test-your-application}.md
  • docs/rust/{README,build-directly-in-rust,library-reference}.md
  • docs/sdk/how-to-guides/use-external-signers-for-upload-payments.md
• skills/start/version.json — verified_commits.ant-client value refreshed.
• skills/start/SKILL.md — frontmatter verified_commits.ant-client value and frontmatter verified_date refreshed. Body, version, published_date, and CHANGELOG.md unchanged.
• planning/sweeps/2026-07-27.md — new run summary.

Verification run:

• Sweep envelope: confirmed — every docs change is limited to source_commit:/verified_date: lines; skill changes are limited to the ant-client verified_commits value and the SKILL.md frontmatter verified_date; no changes under scripts/, .github/, repo-registry.yml, component-registry.yml, or CHANGELOG.md.
• scripts/sweep_poll.py re-run on the prepared branch: status: "ok", drifted: 0, no malformed-block errors.
• version.json: parsed and valid JSON.
• SKILL.md body: byte-identical to base (linked-release fields correctly left unchanged).
• Upstream re-grep at head SHA: ant-cli and ant-core present; the SHA range touches only Cargo files and one test-support file.
• markdownlint / link checkers: skipped — not configured in this repo.

Uncertainties: none. docs/cli/command-reference.md renders "version": "0.4.0" inside an illustrative node-status payload; this is an example field value (documented generically as "Node binary version"), not a pinned release-version claim, so the ant-core version bump does not require a prose edit.

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