Verify and version canonical network identity

[ipicoinrepo]

Context

The repository currently contains legacy values for ipi-mainnet-2 and historical endpoints. They are explicitly not a canonical production release record.

Acceptance criteria

• add a machine-readable schema and validation for all exported fields
• bind a versioned configuration to the exact genesis hash and supported node release
• verify chain ID, Bech32 prefixes, BIP-44 coin type, denominations, decimals, and declared features
• test every public endpoint for chain identity and document its independent operator
• define environment names and prevent chain ID reuse across incompatible genesis states
• publish a review and migration process for configuration changes
• add fixtures that fail on mismatched chain identity, denomination, or endpoint responses

Tests must not require secrets and must distinguish endpoint availability from independently verified state.