Make workspace context discovery ignores configurable

[alanzchen]

Summary

• add DEVSPACE_CONTEXT_IGNORE_PATHS and the persisted contextIgnorePaths configuration field
• keep the default empty so no additional directories are ignored unless explicitly configured
• normalize and deduplicate workspace-relative entries while rejecting absolute paths, parent traversal, and invalid values
• prune exact matching directories before opening them during nested AGENTS.md and CLAUDE.md discovery
• preserve the setting through devspace init --force and display the resolved list in serve and doctor
• document matching behavior and the distinction between discovery pruning and filesystem access control

Why

Opening a workspace currently walks every directory while looking for nested instruction files. Large, remote, or FUSE-backed resource trees can make open_workspace slow or block it entirely.

Behavior

The default ignore list is empty. Configured entries are normalized literal paths relative to the opened workspace root, not globs. Matching is exact, so ignoring external-resources does not ignore external-resources-old or nested/external-resources.

The setting affects only nested instruction discovery. Ignored paths remain available to normal workspace file and shell tools and are not treated as a filesystem security boundary.

Validation

• npm test
• npm run typecheck
• npm run build
• focused configuration and workspace traversal tests
• verified ignored directories are never opened by the discovery walker
• verified exact-match siblings remain discoverable and ignored files remain resolvable
• npm pack --dry-run
• DEVSPACE_CONTEXT_IGNORE_PATHS=external-resources node dist/cli.js doctor

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