feat(quick): add --full flag for plan-checking and verification

Enables quality guarantees on quick tasks without full milestone ceremony.
--full spawns plan-checker (max 2 iterations) and post-execution verifier,
produces VERIFICATION.md, and adds Status column to STATE.md table.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

commands/gsd/quick.md

@@ -1,7 +1,7 @@
 ---
 name: gsd:quick
 description: Execute a quick task with GSD guarantees (atomic commits, state tracking) but skip optional agents
-argument-hint: ""
+argument-hint: "[--full]"
 allowed-tools:
   - Read
   - Write
@@ -13,15 +13,16 @@ allowed-tools:
   - AskUserQuestion
 ---
 <objective>
-Execute small, ad-hoc tasks with GSD guarantees (atomic commits, STATE.md tracking) while skipping optional agents (research, plan-checker, verifier).
+Execute small, ad-hoc tasks with GSD guarantees (atomic commits, STATE.md tracking).
 
 Quick mode is the same system with a shorter path:
 - Spawns gsd-planner (quick mode) + gsd-executor(s)
-- Skips gsd-phase-researcher, gsd-plan-checker, gsd-verifier
 - Quick tasks live in `.planning/quick/` separate from planned phases
 - Updates STATE.md "Quick Tasks Completed" table (NOT ROADMAP.md)
 
-Use when: You know exactly what to do and the task is small enough to not need research or verification.
+**Default:** Skips research, plan-checker, verifier. Use when you know exactly what to do.
+
+**`--full` flag:** Enables plan-checking (max 2 iterations) and post-execution verification. Use when you want quality guarantees without full milestone ceremony.
 </objective>
 
 <execution_context>
@@ -30,6 +31,7 @@ Use when: You know exactly what to do and the task is small enough to not need r
 
 <context>
 @.planning/STATE.md
+$ARGUMENTS
 </context>
 
 <process>