docs: default finishing-a-development-branch to push and create PR (#39)

Override the finishing-a-development-branch skill to always default to
"Push and create a Pull Request" without presenting the interactive
4-option prompt. This aligns with the project's PR-based integration
model where all changes go through pull requests.

Closes #37

Author: limbibot

CLAUDE.md

@@ -207,6 +207,10 @@ These superpowers skills are mandatory process gates — not optional.
 
 `/systematic-debugging` and `/receiving-code-review` are reactive — invoke when their triggers occur at any point.
 
+### Skill Overrides
+
+**`/finishing-a-development-branch`:** Always default to "Push and create a Pull Request" (Option 2) without presenting the interactive prompt. This aligns with the project's PR-based integration model — all changes go through pull requests. Only deviate from this default if the user has explicitly instructed otherwise in advance.
+
 ---
 
 ## Issue-Driven Workflow