feat: initial blink-cmp-ssh implementation

Problem: the existing blink-cmp-sshconfig plugin uses a synchronous,
build-time Python scraping approach that requires uv and make to
generate a static Lua file.

Solution: implement a runtime, async blink.cmp source that parses
ssh_config keywords from man ssh_config and enum values from ssh -Q
queries, matching the architecture of blink-cmp-tmux and
blink-cmp-ghostty.

blink-cmp-ssh-scm-1.rockspec

@@ -0,0 +1,30 @@
+rockspec_format = '3.0'
+package = 'blink-cmp-ssh'
+version = 'scm-1'
+
+source = {
+  url = 'git+https://github.com/barrettruth/blink-cmp-ssh.git',
+}
+
+description = {
+  summary = 'SSH configuration completion source for blink.cmp',
+  homepage = 'https://github.com/barrettruth/blink-cmp-ssh',
+  license = 'MIT',
+}
+
+dependencies = {
+  'lua >= 5.1',
+}
+
+test_dependencies = {
+  'nlua',
+  'busted >= 2.1.1',
+}
+
+test = {
+  type = 'busted',
+}
+
+build = {
+  type = 'builtin',
+}