Avoid repeat dev up setup work

[isaacroldan]

Summary

• make repeat dev up skip dependency install, schema fetch, Playwright Chromium install, and node-pty rebuild when local sentinels match
• store sentinels under ignored node_modules/.dev-up
• keep the original expensive setup commands as repair paths when inputs or installed artifacts are missing/stale

Validation

• ruby -e 'require "yaml"; YAML.load_file("dev.yml"); puts "YAML OK"'
• Ruby script running sh -n and zsh -n over each custom met?/meet snippet from dev.yml
• git diff --check

Skipped heavy setup commands locally; this worktree has no node_modules, and the change is intended to avoid running those commands unless required.

[isaacroldan]

• Avoid repeat dev up setup work #7814 👈 (View in Graphite)
• main

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