fix: add missing cmd/ (gitignore was excluding source dirs)

The initial commit's .gitignore had unanchored 'encapi' and 'encapi-cli'
patterns intended for built binaries; they also matched the cmd/encapi and
cmd/encapi-cli source directories, so those were silently never committed. The
tag build then failed with 'stat /build/cmd/encapi: directory not found'.

- anchor the binary ignores to the repo root (/encapi, /encapi-cli)
- add the cmd/encapi (server) and cmd/encapi-cli (CLI) main packages

.gitignore

@@ -2,5 +2,7 @@
 /dist/
 *.rpm
 *.zip
-encapi
-encapi-cli
+# Root-level dev binaries only — anchored so cmd/encapi and cmd/encapi-cli
+# (the source packages) are NOT ignored.
+/encapi
+/encapi-cli