fix: Update remaining version files to 0.30.3

Files missed in manual version bump:
- .claude-plugin/plugin.json
- .claude-plugin/marketplace.json
- integrations/beads-mcp/pyproject.toml
- integrations/beads-mcp/__init__.py
- Hook templates

Generated with Claude Code

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

cmd/bd/templates/hooks/post-checkout

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.2
+# bd-hooks-version: 0.30.3
 #
 # bd (beads) post-checkout hook
 #

cmd/bd/templates/hooks/post-merge

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.2
+# bd-hooks-version: 0.30.3
 #
 # bd (beads) post-merge hook
 #

cmd/bd/templates/hooks/pre-commit

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.2
+# bd-hooks-version: 0.30.3
 #
 # bd (beads) pre-commit hook
 #

cmd/bd/templates/hooks/pre-push

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.30.2
+# bd-hooks-version: 0.30.3
 #
 # bd (beads) pre-push hook
 #