Make shiny formula and crew template policy-neutral for merge workflow

- shiny.formula.toml: defers to role's git workflow instead of hardcoding PR
- crew.md.tmpl: checks remote origin ownership instead of absolute PR ban
- tmux.go: minor comment fix

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.beads/formulas/shiny.formula.toml

@@ -27,7 +27,7 @@ needs = ["review"]
 title = "Test {{feature}}"
 
 [[steps]]
-description = "Submit for merge. Final check: git status, git diff. Commit with clear message. Push and create PR."
+description = "Submit for merge. Final check: git status, git diff. Commit with clear message. Follow your role's git workflow for landing code."
 id = "submit"
 needs = ["test"]
 title = "Submit for merge"

internal/formula/formulas/shiny.formula.toml

@@ -27,7 +27,7 @@ needs = ["review"]
 title = "Test {{feature}}"
 
 [[steps]]
-description = "Submit for merge. Final check: git status, git diff. Commit with clear message. Push and create PR."
+description = "Submit for merge. Final check: git status, git diff. Commit with clear message. Follow your role's git workflow for landing code."
 id = "submit"
 needs = ["test"]
 title = "Submit for merge"