feat: complete runtime configuration boundary coverage

[Brad-Edwards]

Plain-Language Summary

• Context: Runtime configuration exposes portable settings whose author intent must survive planning and execution.
• Problem: Many valid settings could bypass SEM-218 authority, backend admission, independent observation, and safe persistence.
• Fix: Register every portable boundary, delegate already-owned stateful paths, and enforce closed concern-specific realization checks.

Requirement UIDs

• (none — bug/refactor/maintenance run; see Traceability section below)

Issue Tracking

Closes #1078

ADR Impact

• ADR-021
• ADR-056
• ADR-057

Changes

• Add an executable 32-field RuntimeConfiguration ownership inventory and register canonical typed concern descriptors at independently governed leaf boundaries.
• Compile complete realization requirements and plan authority, with fail-closed exact, constrained, and open support checks plus concern-specific observation corroboration.
• Canonicalize closed runtime projections, stable collection ordering, and value-free commitments for protected runtime material.
• Update SEM-218 documentation, formal validation snapshots, and conformance coverage, including synchronized generated-artifact environment delivery behavior.

Verification

• Unit tests pass
• Integration tests pass if applicable
• Configured completion command passes
• No coverage regression

Ground Control completion and policy gates passed on the synchronized merge tree. Focused issue #1074/#1078 integration coverage passed 149 tests; the isolated unit sweep passed 7,227 tests with 1 skip and 4 expected failures.

Ground Control Checks

• Configured repository policy command passes
• Pre-push code review and test-quality review completed; all findings fixed or dispositioned

Traceability

• IMPLEMENTS: Issue Complete SEM-218 boundary coverage across RuntimeConfiguration #1078 ← implementations/python/packages/raes_processor/semantics/realization_concerns.py, SEM-218 ← implementations/python/packages/raes_processor/compiler/realization_requirements.py, SEM-218 ← implementations/python/packages/raes_contracts/realization_authority.py
• TESTS: Issue Complete SEM-218 boundary coverage across RuntimeConfiguration #1078 ← implementations/python/tests/test_issue_1078_runtime_boundary_coverage.py, SEM-218 ← implementations/python/tests/test_sem_218_realization_designation.py, SEM-218 secret boundary ← implementations/python/tests/test_issue_985_runtime_observation_contract.py

Checklist

• Code follows the repository coding standards
• Changelog: owned by Release Please (generated from the Conventional Commit PR title; no per-PR fragment)
• Architectural docs updated if stack, package structure, or key behaviors changed

Documentation

Updated: see diff.