refactor(omo-codex): rename ultragoal component to ulw-loop

Fully rename the ultragoal component to ulw-loop so the identifier
matches the ulw-loop skill it powers. Renames the component directory,
nested skill, TS identifiers (UlwLoop / ULW_LOOP_* / ulwLoop*), the
omo ulw-loop CLI subcommand, the .omo/ulw-loop state directory, the
OMO_ULW_LOOP_STEER directive token, and the @code-yeongyu/codex-ulw-loop
package. Also threads Atlas-style right-sized parallel worker delegation
and a Prometheus-style QA + maximum-parallelism plan into the ulw-loop
skill, with a critical post-subagent QA gate.

Updates aggregate wiring (plugin package components, hooks.json,
sync-skills), the install-codex agent-link test fixture, and user docs.

packages/omo-codex/plugin/components/ulw-loop/.gitattributes

@@ -0,0 +1,13 @@
+# Normalize line endings: store LF in git, check out LF on every platform.
+# Required so biome's --check passes on Windows (default core.autocrlf=true).
+* text=auto eol=lf
+
+# Explicit binary types
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.zip binary
+*.tgz binary
+*.gz binary