chore(openspec): drop 9 superseded proposals + 11 stub archive files

Drop 9 batch proposals that are superseded by the boocode-lift-analysis
(boocontext-audit, conductor upgrades, self-healing/verify-gate skills):
add-3tier-memory, import-llm-evaluator, import-pregel-engine, plugin-platform,
conductor-evolution, code-intelligence-upgrade, dev-workflow, ui-overhaul,
agent-reliability.

Delete 11 stub archive files (49-66B each, 'Status: Shipped. Archived.' only)
that provide zero documentation value over the existing CHANGELOG.md + git tags.

openspec/changes/add-behavioral-engine/specs/relational-resolver/spec.md

@@ -0,0 +1,21 @@
+## ADDED Requirements
+
+### Requirement: DEPENDS_ON resolution
+- **WHEN** guideline A depends on guideline B
+- **THEN** B is activated if A is activated
+
+### Requirement: PRIORITIZES resolution
+- **WHEN** guideline A prioritizes over guideline B
+- **THEN** B is filtered out if both match
+
+### Requirement: ENTAILS resolution
+- **WHEN** guideline A entails guideline B
+- **THEN** B is automatically activated when A is activated
+
+### Requirement: Iterative convergence
+- **WHEN** resolving relationships
+- **THEN** the resolver iterates (max 100 iterations) until no more changes or stable state
+
+#### Scenario: Conflicting guideline resolution
+- **WHEN** a HIGH priority guideline matches and a LOW priority guideline also matches
+- **THEN** the LOW priority guideline is filtered out via numerical priority resolution