docs(links): record C4 hosted verification

[josecelano]

Records independently reviewed hosted verification for the C4 repository-controlled stale-link repair after PR #2212 merged.

Evidence

• External Link Check run 34843399874 ran on merged develop revision 618723d49283432a99ea5604fc31becfa1a63a84.
• The advisory check failed visibly with 28 unrelated errors; lychee-external-link-report uploaded successfully and is retained through 2026-09-28.
• The report contains none of C4's three retired repository-controlled URLs and retains representative unrelated Caddy, third-party, FSF, Docker, GitHub-fragment, and Star History failures.
• Issue-local independent review confirms the C4 evidence while C5-C8 and broader completion remain pending.

Related to #2185

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Pull request overview

This documentation-only PR records hosted verification for the C4 stale-link repairs after PR #2212 merged.

Changes:

• Updates issue progress and acceptance evidence with run 34843399874.
• Records C4 report details and confirms unrelated failures remain visible.
• Appends the independent hosted-verification review.

File summaries

File	Description
docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/ISSUE.md	Updated as part of this pull request.
docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/external-link-baseline.md	Updated as part of this pull request.
docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/agent-review-reports.md	Updated as part of this pull request.

Review details

Suppressed comments (3)

docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/ISSUE.md:144

• Use the plural noun here: the sentence refers to the targets for both C3 and C4, not one combined target.

- [ ] AC2: Each repair changes only a verified stale reference and records why its replacement target is correct. C3 and C4 target and hosted verification are recorded; remaining repair slices must be verified before AC2 can be completed.

docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/ISSUE.md:181

• Use the plural noun here: the evidence row refers to the targets for both C3 and C4, not one combined target.

| AC2   | TODO                   | C3 and C4 target and hosted verification are recorded; remaining repair slices must be verified. |

docs/issues/open/2185-2003-triage-advisory-external-link-check-findings/agent-review-reports.md:114

• This appended review entry still ends in REVIEW WARNED and says to add run 34843399874 to AC5, even though this same PR already adds that run at ISSUE.md:184. Because the report contract requires corrections to be recorded as a new entry rather than editing history, append a follow-up entry naming this warning and confirming the correction; otherwise the latest review record remains stale for the final diff.

  - Correction required: Add run 34843399874 to AC5's evidence row so the documented evidence explicitly includes the hosted rerun for the C4 remediation slice.
  - Pending: Keep T2 and AC2 pending for C5-C8 and remaining repair verification. Keep all issue-wide quality, manual-verification, acceptance-review, implementation-completion-review, and closure criteria pending.
- Verdict: REVIEW WARNED.
- Follow-up actions:
  - Make the AC5 evidence-row correction.

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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[josecelano]

ACK b93fa5b