feat: detect agents across all workspace folders in multi-root workspaces

[Commandershadow9]

Motivation

VS Code's multi-root workspaces let users open multiple project folders in a single window. Claude Code writes JSONL transcripts to a directory based on the workspace path — so each folder gets its own project directory under ~/.claude/projects/.

Currently, ensureProjectScan only registers the first workspace folder's project directory. If a user starts Claude Code in their second or third folder, those sessions are never detected because their JSONL directory isn't being watched.

Example: User has ~/frontend and ~/backend open as a multi-root workspace. They start Claude in ~/backend — the agent works fine but never appears in the Pixel Agents panel because only ~/frontend's project dir is scanned.

Changes

src/fileWatcher.ts

• ensureProjectScan now maintains a module-level Set<string> of tracked project directories
• The shared interval timer iterates over all tracked dirs instead of just one
• Calling ensureProjectScan multiple times with different dirs is safe and idempotent — the seed logic always runs but the timer only starts once

src/PixelAgentsViewProvider.ts

• On webviewReady, registers project dirs for all workspace folders (not just the first)
• Each additional folder's project dir is logged for debugging

Backward compatibility

• Single-folder workspaces: No behavior change — one dir is registered and scanned as before
• No workspace open: No behavior change — the extension handles null project dir gracefully
• Multi-folder workspaces: All folders' project dirs are now scanned
• The ensureProjectScan function signature is unchanged — existing callers in agentManager.ts work without modification

Test plan

• Single-root workspace: Verify agents are detected as before (no regression)
• Multi-root workspace: Create one with 2+ folders (File → Add Folder to Workspace)
• Start Claude Code in each folder
• Verify all agents appear in the Pixel Agents panel regardless of which folder they run in
• Check Developer Console for [Pixel Agents] Registering additional project dir: log messages
• Remove a folder from the workspace — verify existing agents continue working

🤖 Generated with Claude Code