[link-checker] Fix broken gh-aw reference links in cost-tracker docs - #385

Summary

Fixed 2 broken links discovered by the daily link checker. All other "broken" links in the latest scan were false positives — the link checker's regex captured trailing markdown punctuation (e.g. ), )., )**) as part of the URL, so links like https://github.com/githubnext/crane) report 404 even though https://github.com/githubnext/crane (without the trailing )) is a perfectly valid, working URL. These are not real issues and require no fix.

Links fixed

Root cause: the links used the wrong domain (github.github.com instead of the real gh-aw docs domain github.github.io) and pointed at nonexistent paths (reference/token-usage/, reference/firewall/). I verified via the github GitHub repo (github/gh-aw) docs source that:

• token-usage.jsonl is documented under the Artifacts reference page, specifically the firewall-audit-logs section.
• Firewall/network configuration is documented under the Network reference page.

Both new URLs were confirmed to resolve successfully.

Unfixable links (cache memory)

• https://github.com/owner/repo/vex/GHSA-xvch-5gv4-984h in docs/vex-generator.md — intentional placeholder/example URL, not a real link. Remains in the unfixable list (unchanged from prior runs).

The two github.github.com/gh-aw/reference/{token-usage,firewall}/ entries were removed from the unfixable list since they are now fixed.

Verification

Cross-checked all 53 "❌ broken" entries from link-check-results.md against the 72 "✅ working" entries by stripping trailing markdown punctuation — only 3 genuinely lacked a working counterpart, and 2 of those are the links fixed here.

Generated by Daily Link Checker & Fixer · copilot · auto · 74.2 AIC · ⌖ 17.7 AIC · ⊞ 9K · ◷