- Remove queue_config.max_retries option from observability.nix
- Option deprecated/removed in recent NixOS/Prometheus versions
- Found by nix eval audit (T039.S3 pre-deployment validation)
Error: services.prometheus.remoteWrite."[...]".queue_config.max_retries' does not exist
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
- Replace form_urlencoded with RFC 3986 compliant URI encoding
- Implement aws_uri_encode() matching AWS SigV4 spec exactly
- Unreserved chars (A-Z,a-z,0-9,-,_,.,~) not encoded
- All other chars percent-encoded with uppercase hex
- Preserve slashes in paths, encode in query params
- Normalize empty paths to '/' per AWS spec
- Fix test expectations (body hash, HMAC values)
- Add comprehensive SigV4 signature determinism test
This fixes the canonicalization mismatch that caused signature
validation failures in T047. Auth can now be enabled for production.
Refs: T058.S1
