fix(run): ignore engine-owned outputs in watch mode

[GaspardKirira]

Summary

Prevent build outputs, generated metadata, caches, and runtime recordings from
triggering recursive rebuild loops.

Requirements

• Ignore resolved build directories.
• Ignore engine state directories.
• Ignore object and artifact caches.
• Ignore .vix/runs.
• Ignore generated CMake metadata.
• Match exact owned paths instead of broad name prefixes.
• Allow required generated source inputs explicitly.

Acceptance criteria

• Build outputs do not trigger watch restarts.
• Cache writes do not trigger watch restarts.
• Replay writes do not trigger watch restarts.
• Directories such as builder remain watchable.
• Required generated sources remain watchable.