ci: add RPC consistency checker CLI

**Validation:** Client, daemon, proxy, and tools now consume the same parsed

topology model. Full unit suite passes: 82 test cases and 3,464,810 assertions.

### 21. Generate RPC registration and consistency checks

Run the existing RPC consistency checker in CI and fail on orphaned, missing,

or mismatched tags, structs, registrations, and handlers. Consider a declarative

RPC description to generate tags and registration glue. Add protocol versioning,

rolling-upgrade checks, unknown-tag tests, malformed-payload tests, and

incompatible-version tests.

### 21. Generate RPC registration and consistency checks — in progress

Added a stable `scripts/check_rpc_consistency.py` CLI around the existing

checker, centralized project scanning, and made `ORPHAN`, `MISSING`, and

CLI help, and critical-severity policy.

CLI help, and critical-severity policy. Added the checker as a CI lint job.

Remaining work: CI integration, declarative RPC descriptions or generated registration glue,

Remaining work: declarative RPC descriptions or generated registration glue,

protocol versioning, rolling-upgrade checks, unknown-tag tests,

malformed-payload tests, and incompatible-version tests.

### 22. Consolidate error handling and result types