fix(install): harden ECC installer lifecycle

Make Antigravity 2.0 installs native and safely migrate legacy state. Ensure doctor, repair, status projection, repeat installs, legacy Codex sync, and uninstall converge without losing user files. Exclude Python bytecode and harden repo-scan bootstrap guidance.

Gate publishing and pull-request merges on one exact packed artifact completing install, repeat, drift, repair, status, and uninstall across Linux, macOS, and Windows.

Co-authored-by: lorencifernando-coder <lorenci.fernando@gmail.com>

Co-authored-by: Suliman Abdulrazzaq <suliman9000a@gmail.com>

Co-authored-by: Wu Shuwen <mikewushuwen@outlook.com>

yarn.lock

@@ -586,6 +586,7 @@ __metadata:
     c8: "npm:11.0.0"
     eslint: "npm:10.6.0"
     globals: "npm:17.4.0"
+    js-yaml: "npm:4.3.1"
     markdownlint-cli: "npm:0.48.0"
     sql.js: "npm:1.14.1"
     typescript: "npm:6.0.3"
@@ -1068,14 +1069,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"js-yaml@npm:4.3.0":
-  version: 4.3.0
-  resolution: "js-yaml@npm:4.3.0"
+"js-yaml@npm:4.3.1":
+  version: 4.3.1
+  resolution: "js-yaml@npm:4.3.1"
   dependencies:
     argparse: "npm:^2.0.1"
   bin:
     js-yaml: bin/js-yaml.js
-  checksum: 10c0/058b30473d6915ca5b4feb11e2f7d4d97242f98d00a798ed48dd90b46b7c640398afe9128c5db22c5300f8c6528fe2a174b9a93f351a70ebc28c6203938d8bff
+  checksum: 10c0/13c500ca322e0c3f8c81686e6ecda96d2ea37b45247a420c17c7db36932d6965cc27391abc2d1a104501600e7f0d947a5f8b7be6db619c4fefa87901b3512807
   languageName: node
   linkType: hard