Revert commands/ wrappers — skills are already indexed in the / menu

In current Claude Code, commands are merged into skills and skills are already
user-invocable and indexed in the / typeahead by default; on a same-name
collision the skill wins, so the wrappers added in 0.5.0 were shadowed no-ops
that only duplicated the inventory (details showed each name twice) and added
always-on token cost.

The user's symptom (`/dev` shows nothing, full `/dev-loop:<skill>` executes) is a
typeahead-matching detail — the menu matches by skill name / full namespace, not
the partial `dev` prefix — not a missing-entry bug. Remove commands/.

Bump 0.5.0 -> 0.6.0.

Author: choiyounggi

.claude-plugin/marketplace.json

@@ -20,7 +20,7 @@
         "url": "https://github.com/choiyounggi/dev-loop.git"
       },
       "homepage": "https://github.com/choiyounggi/dev-loop",
-      "version": "0.5.0",
+      "version": "0.6.0",
       "tags": [
         "orchestrator",
         "verification-loop",

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "dev-loop",
   "description": "loop-orchestrator's verification loop (TDD / PDCA / Reflexion) with the plan step FIXED to a wiki-grounded planning methodology (wiki-plan): every design decision is routed to a bundled semantic-layer wiki before code is written. Adds a knowledge-capture loop — sessions emit verified insights, and knowledge-flush researches, dedups, routes, and opens a wiki PR for owner review.",
-  "version": "0.5.0",
+  "version": "0.6.0",
   "author": {
     "name": "choiyounggi",
     "url": "https://github.com/choiyounggi"

README.md

@@ -160,8 +160,7 @@ dev-loop/
 ├── .claude-plugin/{plugin,marketplace}.json
 ├── AGENTS.md INDEX.md templates/     # wiki schema + routing entry + page template
 ├── wiki/                             # 10-domain semantic-layer knowledge base
-├── commands/                         # slash-command wrappers (so /dev-loop:* shows in the / menu)
-├── skills/                           # the 8 skills above
+├── skills/                           # the 8 skills above (user-invocable; appear in the / menu by skill name)
 ├── agents/test-quality-auditor.md    # bundled independent test auditor (loop step 6.5)
 ├── hooks/
 │   ├── hooks.json