fix(#2949): wire sketch --wrap-up flag dispatch (#2953)

* fix(#2949): wire sketch --wrap-up flag dispatch

Add dispatch logic to commands/gsd/sketch.md so --wrap-up routes to the
sketch-wrap-up workflow instead of silently falling through to the normal
sketch workflow. Also adds sketch-wrap-up.md to execution_context and
updates companion references in workflows/sketch.md from the deleted
/gsd-sketch-wrap-up command to /gsd-sketch --wrap-up.

Fixes #2949

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

* fix(#2949): use exact-match "If it is" instead of "If it contains" for --wrap-up dispatch

Aligns with the established pattern across all consolidated commands
(workspace.md, update.md, progress.md) where the first-token check uses
"If it is `--flag`" for exact equality, not substring matching.

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

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,10 @@ Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased](https://github.com/gsd-build/get-shit-done/compare/v1.38.5...HEAD)
 
+### Fixed
+
+- **`sketch --wrap-up` now dispatches correctly** — `/gsd-sketch --wrap-up` was silently no-oping because the flag dispatch wiring was omitted when the micro-skill entry point was absorbed in #2790. (#2949)
+
 ### Added — 1.40.0-rc.1
 - **Six namespace meta-skills with keyword-tag descriptions** — replace the flat 86-skill
   listing with two-stage hierarchical routing. Model sees 6 namespace routers