feat(cursor-agent): add provider for cursor-agent CLI sessions

Discovers transcripts at ~/.cursor/projects/*/agent-transcripts/*.txt
and joins against ~/.cursor/ai-tracking/ai-code-tracking.db for model
attribution. Token counts are estimated from transcript character
length since the attribution DB does not carry them; the model label
surfaces the estimation with an (est.) suffix on every row.

Deduplication keys prefix cursor-agent: to stay disjoint from the
existing cursor: prefix so the two providers do not cross-dedupe
on shared conversationId namespaces.

Tests cover: empty ~/.cursor/projects/, single transcript, multiple
projects, missing ai-code-tracking.db, unrecognized transcript format
skip, non-UUID filename fallback, and sqlite metadata join.

Closes #55

Author: mvanhorn

README.md

@@ -17,7 +17,7 @@
   <img src="https://raw.githubusercontent.com/getagentseal/codeburn/main/assets/dashboard.jpg" alt="CodeBurn TUI dashboard" width="620" />
 </p>
 
-By task type, tool, model, MCP server, and project. Supports **Claude Code**, **Codex** (OpenAI), **Cursor**, **OpenCode**, **Pi**, and **GitHub Copilot** with a provider plugin system. Tracks one-shot success rate per activity type so you can see where the AI nails it first try vs. burns tokens on edit/test/fix retries. Interactive TUI dashboard with gradient charts, responsive panels, and keyboard navigation. Native macOS menubar app in `mac/`. CSV/JSON export.
+By task type, tool, model, MCP server, and project. Supports **Claude Code**, **Codex** (OpenAI), **Cursor**, **cursor-agent**, **OpenCode**, **Pi**, and **GitHub Copilot** with a provider plugin system. Tracks one-shot success rate per activity type so you can see where the AI nails it first try vs. burns tokens on edit/test/fix retries. Interactive TUI dashboard with gradient charts, responsive panels, and keyboard navigation. Native macOS menubar app in `mac/`. CSV/JSON export.
 
 Works by reading session data directly from disk. No wrapper, no proxy, no API keys. Pricing from LiteLLM (auto-cached, all models supported).
 
@@ -108,6 +108,7 @@ codeburn report                      # all providers combined (default)
 codeburn report --provider claude    # Claude Code only
 codeburn report --provider codex     # Codex only
 codeburn report --provider cursor    # Cursor only
+codeburn report --provider cursor-agent  # cursor-agent CLI only
 codeburn report --provider opencode  # OpenCode only
 codeburn report --provider pi        # Pi only
 codeburn report --provider copilot   # GitHub Copilot only