Add firewall IPv6 temporary rule evidence fixtures

[jddark62]

Summary

• adds IPv6 parity evidence gates for enabled/routed status, IPv4/IPv6 default-deny parity, privileged ::/0 ingress, unrestricted IPv6 egress, and IPv6 logging parity
• adds temporary-rule and exception evidence gates for owner, ticket, expiry/review date, renewal/removal plan, dependency validation, and broad emergency-access governance
• extends report output with IPv6 parity and temporary-rule tables
• adds 7 fixtures covering IPv6 disabled Not Applicable, reachable IPv6 SSH exposure, iptables/ip6tables default-policy drift, controlled IPv6 HTTPS egress via proxy, unrestricted IPv6 egress, expired temporary DB access, and zero-hit removal after counter reset

Validation

• git diff --check
• verified SKILL.md frontmatter fields
• verified Markdown fence balance
• parsed all 7 YAML fixture blocks
• verified markers for FW-IPV6-*, FW-TEMP-*, ::/0, ip6tables, ipv6_cidr_blocks, temporary-rule output, Not Applicable, and Not Evaluable
• verified added lines and fixture file are ASCII-only
• verified AWS, Azure, and Google Cloud firewall reference links returned HTTP 200
• privacy scan passed for changed files

/claim #1260

Payment details can be coordinated privately after maintainer acceptance.