Feature Request: [Grid] Standarize fingerprint Format Between Grid Operator and Praxis

[mvazquezc]

Problem:

The Grid operator and Praxis use different fingerprint formats for the same certificate:

Component	Field	Format	Hash input
GridSite CRD	spec.trust.certFingerprint	Colon-separated hex (ab:cd:ef:...)	SHA-256 of trimmed PEM bytes
Praxis	peer_identity_trust.cert_digest	Plain hex, 64 chars (abcdef...)	SHA-256 of DER-encoded cert

The Grid operator's sha256_fingerprint() hashes the PEM string bytes, while Praxis hashes the DER-encoded X.509 certificate. They also use different output formats (colons vs plain). Using one format in the other's config field causes silent 403 rejections or startup failures.

Proposal:

Standardize on one format and hash input across both systems.