chore(openspec): drop 9 superseded proposals + 11 stub archive files

Drop 9 batch proposals that are superseded by the boocode-lift-analysis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/archived/2026-06-07-boocontext/specs/codebase-context/spec.md

@@ -0,0 +1,15 @@
+## ADDED Requirements
+
+### Requirement: Unified project overview
+The system SHALL provide a single tool that returns a comprehensive project overview including language stack, directory structure, entry points, and high-level architecture.
+
+#### Scenario: Overview returned for any repo
+- **WHEN** a user requests a project overview
+- **THEN** the system SHALL return language stack, key directories, dependency graph, and entry points
+
+### Requirement: Context map with compression
+The system SHALL provide a context map (file listing with annotations) using DCP compression for large payloads.
+
+#### Scenario: Compressed context map
+- **WHEN** a repo exceeds threshold size for a full scan
+- **THEN** the system SHALL apply DCP compression to reduce payload

openspec/changes/archived/2026-06-07-boocontext/specs/codebase-health/spec.md

@@ -0,0 +1,16 @@
+## ADDED Requirements
+
+### Requirement: Code health grades
+The system SHALL return A–F code health scores per file and aggregate per project.
+
+#### Scenario: File health score
+- **WHEN** a file is analyzed for code health
+- **THEN** it SHALL receive a score from 10.0 (optimal) to 1.0 (worst)
+- **THEN** the score SHALL be mapped to A–F grade
+
+### Requirement: Hotspot detection
+The system SHALL identify technical debt hotspots — files with high revision count and low code health.
+
+#### Scenario: Hotspots listed
+- **WHEN** a project is scanned for hotspots
+- **THEN** files with high churn and low health SHALL be ranked

openspec/changes/archived/2026-06-07-boocontext/specs/codebase-types/spec.md

@@ -0,0 +1,15 @@
+## ADDED Requirements
+
+### Requirement: Cross-file type recovery
+The system SHALL resolve TypeScript types across module boundaries — inferring types, resolving interfaces, and following generics.
+
+#### Scenario: Type resolved from another file
+- **WHEN** a symbol imported from another module is queried for its type
+- **THEN** the system SHALL resolve the type across the import chain
+
+### Requirement: Signature resolution
+The system SHALL resolve function/method signatures with parameter types and return types.
+
+#### Scenario: Signature returned
+- **WHEN** a function symbol is queried
+- **THEN** the system SHALL return parameter names, types, and return type