SDK PR #90 — networkUpgrade/networkUpgradeVote roundTripHash fixtures

[linear]

PR: kynesyslabs/sdks#90
Branch: governance-roundtrip-fixtures → main
Head: 635a7616

What it does

Adds two missing fixtures to src/denomination/roundTripHash.test.ts:

• networkUpgrade content (post-sign canonical shape) round-trips
• networkUpgradeVote content (post-sign canonical shape) round-trips

Plus two trivial override modifier fixups on BroadcastFailedError.cause and TransportError.cause so release v4.0.3 compiles under TypeScript ≥ 5.6's stricter override checking.

Why

Governance content shapes were the only ones not exercised by the SDK↔node byte-equality round-trip test. The gap surfaced while debugging the propose hash mismatch on dev.node2 — without a round-trip fixture for governance content, the SDK side has no canonical guard against accidental drift in the byte shape it ships.

CI status

All green:

• Greptile Review: success
• SonarCloud Code Analysis: success
• CodeQL × 3: success
• CodeRabbit: no actionable comments
• Build: skipped (test-only)

AI feedback addressed

Source	Severity	Issue	Resolution
Greptile	P2	as unknown as GCREdit cast was unnecessary in networkUpgrade fixture	Replaced with satisfies GCREdit (commit 635a7616)
Greptile	P2	Same in networkUpgradeVote fixture	Replaced with satisfies GCREdit (commit 635a7616)

Next step

Reviewer approval. mergeable=MERGEABLE. Zero merge risk — pure test-only change + TS6 build fixups.