chore: remove orphaned test artifacts (bin/act, tmp/)

- Remove bin/act (19MB orphaned binary with no references)
- Remove tmp/ directory (136KB orphaned test output files)
- Add tmp/ and bin/ to .gitignore

These files were added in commits d03f8d2 and 6fafc59 but never
referenced or used in the codebase. Removing them saves ~19.1MB
of repository size.

Author: kanfil

.gitignore

@@ -42,6 +42,8 @@ env/
 .env
 .env.local
 *.lock
+tmp/
+bin/
 
 # Spec Kit-specific files
 .genreleases/