NA-0758: the required-check count is three, not one; NOTICE takes the house form

[Tebbens4832]

What this changes

Three documentation defects found by the NA-0758 public-facing documentation audit.

1. The required-check count, stated twice and wrong both times (census rows AC-01, AR-01)

CONTRIBUTING.md:9
-3) Every PR must pass the single required `rust` CI check.
+3) Every PR must pass the three required CI checks: `rust`, `advisories`, and `infra-literal-scan`.

README.md:34
-- `main` currently requires only the `rust` check
+- `main` currently requires three checks: `rust`, `advisories`, and `infra-literal-scan`

Measured, at the edit rather than carried from the audit:

gh api repos/QuantumShieldLabs/qsl-attachments/branches/main/protection \
  --jq '.required_status_checks.contexts'
["rust","advisories","infra-literal-scan"]

2. NOTICE takes the house form (census rows AN-01 / LI-05)

This was the one NOTICE of four that did not share the shape the others use. The form it adopts here was verified against qsl-protocol, qsl-server and qsl-desktop at their current mains, not assumed.

⚠️ This is a form change, not a licence change. The repository remains AGPL-3.0-only and the sentence saying so is preserved. No LICENSE byte is touched — the licence text itself is a separate operator-owned track and deliberately does not ride a docs PR.

Scope

Documentation only — three files. No code, test, workflow, licence or manifest byte.

infra-literal-scan --mode diff returns clean (diff; 3 files, 13 lines examined), matching the commit's insertion count exactly.

Provenance

Census rows AC-01, AR-01, AN-01/LI-05 of the NA-0758 audit (89 claims across 48 files in 5 repositories; 56 measured TRUE). The identical required-check defect was measured in qsl-server (PR #70) and qsl-desktop, each fixed in its own PR.