Restrict deploy targets to .agents and .claude skill dirs

Remove $HOME/.cline/skills from the default deploy targets everywhere
(SKILL.md, deploy action, CLI help, Taskfiles), document what $HOME is
and how it is resolved, and restore the execute bit on the cli api
scripts (build.sh, scaffold.sh, validate.sh) so 'task build' works.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/src/actions/deploy/action.ts

@@ -7,7 +7,9 @@
  * Default targets (always resolved to absolute paths):
  *   $HOME/.agents/skills/<skill-name>
  *   $HOME/.claude/skills/<skill-name>
- *   $HOME/.cline/skills/<skill-name>
+ *
+ * $HOME is the current user's home directory (e.g. /Users/<username> on macOS,
+ * /home/<username> on Linux), resolved at runtime via os.homedir().
  *
  * Modes:
  *   symlink (default) — creates an absolute-path symlink to the skill source.
@@ -39,7 +41,7 @@ import { basename, join, resolve } from "node:path";
 // Helpers
 // ---------------------------------------------------------------------------
 
-const DEFAULT_TARGETS = [".agents/skills", ".claude/skills", ".cline/skills"];
+const DEFAULT_TARGETS = [".agents/skills", ".claude/skills"];
 
 const COPY_EXCLUDES = new Set(["node_modules", "dist", ".git"]);