feat: implement scope generic extensions R1.3

[Scaxlibur]

Summary

• publish the scope R1.3 models, protocols, capability registry, operation specs, stable Service APIs, CLI commands, and versioned artifacts
• implement bounded PyVISA and RsInstrument binary transport with exact framing, EOM proof, shared operation budgets, bounded resynchronization, and fail-closed session health
• preserve legacy screenshot capture behavior while rejecting v2-only embedding before instrument I/O
• sync the accepted RFC, A1 evidence, core implementation notes, plugin guidance, and output contract for the 0.8.23 development line

Validation

• pytest -q: 1198 passed, 1 skipped, 95 subtests passed
• ruff check .: passed
• git diff --check: passed
• Chinese technical-document lint: 8 files passed
• local Markdown links: 44 passed
• pip check: passed
• DS1000Z plugin: 10 passed
• RTM2000 plugin: 158 passed
• SDS800X HD plugin: 134 passed
• public import order and new CLI help smoke tests: passed

Compatibility and follow-up

• plugins that do not declare the new capabilities keep their existing behavior and minimum core version
• SDS3000 runtime-related tests pass, but its manual capability matrix still records the old 19-item core catalog; the plugin repository must explicitly dispose the 7 new capabilities and update the count to 26 before opting in
• no real instrument I/O was performed; each opt-in plugin still requires resource/backend-specific hardware conformance and state-restoration acceptance