Add debug-only Fluency Level Viewer for scoring transparency

[Copilot]

Adds a debug-only tool to view fluency scoring rules, thresholds, and advancement tips locally. Accessible only when a VS Code debugger is active.

Implementation

Debug gate:

const isDebugMode = vscode.debug.activeDebugSession !== undefined;
if (!isDebugMode) {
  vscode.window.showWarningMessage('Fluency Level Viewer is only available when a debugger is active.');
  return;
}

New components:

• src/webview/fluency-level-viewer/ - Interactive webview with category selector (6 categories) and stage cards (4 stages each)
• getFluencyLevelData() in extension.ts - Defines all 24 stage thresholds/tips matching calculateMaturityScores() logic
• Conditional "🔍 Level Viewer" button in maturity panel header (visible only when isDebugMode)

Data structure:
Each category (Prompt Engineering, Context Engineering, Agentic, Tool Usage, Customization, Workflow Integration) includes:

• Stage 1-4 labels (Skeptic → Explorer → Collaborator → Strategist)
• Specific thresholds (e.g., "At least 30 total interactions", "Using 2+ slash commands")
• Contextual tips for advancement
• Color-coded UI (red/orange/blue/green)

Registration:

• Command: copilot-token-tracker.showFluencyLevelViewer
• Button config: btn-level-viewer in shared navigation
• Test coverage: Added to expectedCommands array

Use cases

• Verify scoring logic during development
• Debug unexpected fluency scores
• Document scoring criteria for users
• Plan feature usage to advance stages

Original prompt

I want to be able to view the fluency scores locally so I can get the messages and tips for the different fluency levels per aspect. This test option should only be available when there is an active debugger active.

Maybe it's an idea to switch a level on the spider chart and then see the different scores/rules that apply to that level and see the suggestions to gain a level?

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