🔵 Coverage / Telemetry — Application-Level Shim

🔵 COVERAGE SHIM — Application-level service routing and telemetry Tier gate: TierShim=Proxy | TierShim=Replace Color: #2563EB (Blue) Overhead: <1% (passthrough mode)

The Coverage Shim intercepts VS Code at the application service level — routing IPC commands through Land’s SwallowMap, proxying the ServiceCollection DI container, and tracking coverage across all 474 decorated services.

🔵 Architecture

┌──────────────────────────────────────────────────────────┐
│  🔵 COVERAGE — Application Layer                         │
├──────────────────────────────────────────────────────────┤
│  IPC SwallowMap         → 15/22 domains                  │
│  ServiceCollection proxy → 35 services (via __CEL__)     │
│  RedirectBus            → Wind/Cocoon/Mountain routing   │
│  AuditLog               → Ring-buffered resolution log   │
│  SwallowMap rules       → Pattern-matching engine        │
│  TierSwallow* per-domain → Individual domain toggles     │
│  CELExposeAccessor      → Workbench bridge hooks         │
├──────────────────────────────────────────────────────────┤
│  Coverage: 15 of 22 core domains (growing)               │
│  Target: 474 decorated services                          │
│  Infrastructure: Ready for full-service replacement      │
└──────────────────────────────────────────────────────────┘

🔵 Coverage by Domain

Domain	Status	Tier	Shim Tier
Status Bar	🔵 SWALLOW	`TierSwallowStatusBar=Swallow`	Replace
SCM / Git	🔵 SWALLOW	`TierSwallowSCM=Swallow`	Replace
Search	🔵 SWALLOW	`TierSwallowSearch=Swallow`	Replace
Terminal	🔵 SWALLOW	`TierSwallowTerminal=Swallow`	Replace
Output	🔵 SWALLOW	`TierSwallowOutput=Swallow`	Replace
File System	🔵 SWALLOW	`TierSwallowFile=Swallow`	Replace
Notifications	🔵 SWALLOW	`TierSwallowNotification=Swallow`	Replace
Dialogs	🔵 SWALLOW	`TierSwallowDialog=Swallow`	Replace
Quick Input	🔵 SWALLOW	`TierSwallowQuickInput=Swallow`	Replace
Keybindings	🔵 SWALLOW	`TierSwallowKeybinding=Swallow`	Replace
Themes	🔵 SWALLOW	`TierSwallowTheme=Swallow`	Replace
Configuration	🔵 SWALLOW	`TierSwallowConfiguration=Swallow`	Replace
Telemetry	🔵 DISCARD	`TierSwallowTelemetry=Discard`	Replace
Extension Gallery	🔵 SWALLOW	`TierSwallowGallery=Swallow`	Replace
Product Identity	🔵 SWALLOW	`TierSwallowProduct=Swallow`	Replace

🔵 Service Coverage Matrix

Category	Total Services	Covered	Coverage %
Workbench UI	25	15	60%
Platform Services	100	35	35%
Editor Core	40	8	20%
Extensions	30	5	17%
Terminal	12	4	33%
Chat/Copilot	25	0	0%
Testing	8	0	0%
Remote	15	0	0%
Misc/Specialized	219	0	0%
Total	474	67	14%

🔵 How It Works

The Coverage Shim uses three interception strategies:

IPC Intercept: IPCInterceptor.ts wraps invoke("MountainIPCInvoke") to check the SwallowMap before forwarding to Mountain’s DispatchMatch.
DI Container Proxy: ProxyServiceCollection.ts wraps ServiceCollection.get() and ServiceCollection.set() to log every service resolution and optionally replace services with Land shims.
Audit Logging: AuditLog.ts maintains a ring buffer of all service resolutions, periodically flushed to Mountain’s dev log for coverage analysis.

🔵 Source Files

File	Purpose
`Land/Element/Wind/Source/Shim/SwallowMap.ts`	Pattern-matching decision engine
`Land/Element/Wind/Source/Shim/RedirectBus.ts`	Handler registration and routing
`Land/Element/Wind/Source/Shim/IPCInterceptor.ts`	Tauri IPC wrapper
`Land/Element/Wind/Source/Shim/AuditLog.ts`	Service resolution auditor
`Land/Element/Wind/Source/Shim/Gate.ts`	TierShim activation gate
`Land/Element/Output/Source/Service/CEL/Land/Shim/Init.ts`	Runtime injection module

Low-Level Shim — The engine-level prototype hooks (orange)
VSCode API Coverage Matrix — API surface coverage
Environment Variables — TierShim and TierSwallow* vars
Build Pipeline — Output Transform injection

🔵 COVERAGE TELEMETRY — ACTIVE — This component tracks service resolution, event routing, and domain coverage. All data flows through Land’s diagnostic pipeline (OTLP/PostHog/dev log). No data leaves the local machine.