Add an exact debugger target registry

[bjdodson-openai]

Description

Adds backend-only exact opaque target discovery and resolution for inspected pages, native runtimes, and Chromium endpoints.

• Makes target identity globally one-to-one across daemon and canonical transport tuples.
• Rejects invalid, duplicate, ambiguous, fragmented, and oversized endpoint claims.
• Advertises only capabilities supported by each target's actual transport.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• Documentation improvement
• Performance optimization
• Test improvement
• Other (new debugger capability)

Testing

• Tests pass locally (bazel test //...)
• Added/updated tests for changes (if applicable)
• Tested on multiple platforms (iOS/Android/Web/macOS as applicable)
• Manual testing performed (describe below)

Testing Details

• Incremental branch: Focused registry/server 96/96, full CLI 372/372, production build, package, lint, format, diff, and repository query passed.
• Assembled debugger stack: npm test passed 436/436; the CLI production build passed.
• Focused //src/valdi_modules/src/valdi/web_renderer:test passed.
• bazel query //... passed.
• The broad Valdi suite reproduced the established 12 unrelated failures; all new debugger specs passed.

Checklist

• Code follows project style guidelines
• Documentation updated (if needed)
• No breaking changes (or documented in description)
• Commit messages follow conventional format
• No secrets, API keys, or internal URLs included

Related Issues

Relates to #154

Additional Context

Stack 17/22. Stacked on #169 (bjd/debugger-console-clear). Review this PR as the single incremental commit c0f45f45 against that base; do not merge it before its parent.

[github-actions]

📊 PR Size: size/XL

Total changes: 2167 lines (7 files)

Top files changed:

• npm_modules/cli/src/debugger/server.spec.ts: +558 -3
• npm_modules/cli/src/debugger/targetRegistry.ts: +524 -0
• npm_modules/cli/src/debugger/targetRegistry.spec.ts: +513 -0
• npm_modules/cli/src/debugger/server.ts: +401 -13
• npm_modules/cli/src/utils/daemonClient.ts: +50 -17
• npm_modules/cli/src/utils/daemonClient.spec.ts: +60 -1
• npm_modules/cli/debugger/README.md: +25 -2

_{Size calculated as additions + deletions. Labels: XS (<10), S (<50), M (<250), L (<1000), XL (1000+)}