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/test/fixtures/steering-proposal.json

@@ -0,0 +1,8 @@
+{
+	"kind": "add_subgoal",
+	"title": "Investigate auth blocker",
+	"objective": "Validate the blocker, capture evidence, and report findings.",
+	"evidence": "log/test output showing the blocker",
+	"rationale": "blocker materially changes safe execution order",
+	"source": "cli"
+}