v0.6.16

Fixed:

• Detect dynamic Nginx status catchalls whose short counters change on every response.
• Bound and expire idle HTTP pool connections during large multi-host scans.

Verified:

• cargo test --locked: 228 passed.
• cargo build --release --locked completed successfully.
• Dynamic Nginx loopback catchall emitted zero false findings.
• Multi-host backup discovery completed under a 96-descriptor process limit.