Documentation followups

[eddyashton]

Follow-ups from #8081 that need some human input:

These discrepancies were not hidden with documentation changes:

1. Preview governance Swagger requires issuer keyFilter, but src/node/gov/handlers/service_state.h does not emit it.
2. Governance JWK schemas describe legacy certificate objects, while runtime and tests use per-key arrays > containing publicKey, issuer, and optional constraint.
3. Governance join-policy schemas use Swagger byte encoding, while handlers emit hexadecimal values.
4. The host RPC protocol schema is unconstrained; runtime treats every value other than udp as TCP.
5. The SNP endorsement URL is schema-required although runtime supports an omitted URL and default endpoint.
6. js/ccf-app/src/global.ts says enableUntrustedDateTime controls Date.now(), while the implementation treats it as a deprecated no-op.
7. Piccolo parses --host but does not apply it.
8. tla/tlc.py may place a Path object in an environment mapping, which breaks Windows trace validation.

[achamayou]

tla/tlc.py may place a Path object in an environment mapping, which breaks Windows trace validation.

I do not think that Windows trace validation is something we claim or aim to support.