Add load-cache-data agent skill for inspecting session file cache

[Copilot]

Adds agent skill to access and display the last 10 entries from the session file cache stored in VS Code globalState, enabling iteration with real data structures during development.

Implementation

New skill: .github/skills/load-cache-data/

• SKILL.md: Cache structure documentation, runtime access patterns, management methods
• load-cache-data.js: CLI tool with --last N, --json, --help options
• README.md: Quick reference guide

Cache Structure

interface SessionFileCache {
  tokens: number;
  interactions: number;
  modelUsage: { [model: string]: { inputTokens: number; outputTokens: number } };
  mtime: number;
  usageAnalysis?: {
    toolCalls: { total: number; byTool: { [name: string]: number } };
    modeUsage: { ask: number; edit: number; agent: number };
    contextReferences: { file: number; selection: number; /* ... */ };
    mcpTools: { total: number; byServer: {}; byTool: {} };
  };
}

Runtime Access

// In extension context
const cache = context.globalState.get<Record<string, SessionFileCache>>('sessionFileCache');
const entries = Object.entries(cache || {})
  .sort((a, b) => (b[1].mtime || 0) - (a[1].mtime || 0))
  .slice(0, 10);

Usage

node .github/skills/load-cache-data/load-cache-data.js          # last 10 entries
node .github/skills/load-cache-data/load-cache-data.js --last 5 # last 5 entries
node .github/skills/load-cache-data/load-cache-data.js --json   # JSON output

Note: Script generates example data since VS Code's globalState is only accessible through extension API at runtime. Documentation provides patterns for real cache access.

Original prompt

Add a new agent skill similar to the rest that loads the last 10 rows from the local cache so we can iterate with real data

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