Add tenant-scoped PrismNET routing, security-group, port, and service-IP APIs plus a deployer reconciler and Nix module that apply declarative tenant network state.
Teach PlasmaVMC to realize PrismNET NICs as a concrete local worker dataplane with Linux bridges, dnsmasq-backed DHCP, tap devices, richer network metadata, stable managed-volume IDs, and file:// image imports.
Expand the VM cluster validation around the new path, including the guest webapp demo, restart and cross-node migration checks, IAM listener reservation hardening, and a flake workspace-source-root audit so Nix builds keep path dependencies complete.
- 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
