fix: resolve {SCRIPT} placeholder and strip strategy key from markdown output

- Pop strategy key from frontmatter after wrap substitution so it does
  not leak into rendered markdown/YAML agent command files
- Call resolve_skill_placeholders + _convert_argument_placeholder for
  the markdown branch so {SCRIPT}/{AGENT_SCRIPT} are resolved and {ARGS}
  is converted to agent-specific format (fixes Codex P2 ordering issue)
- Remove preset key from init-options.json during project init

Author: kennedy-whytech

src/specify_cli/__init__.py

@@ -1273,7 +1273,6 @@ def init(
                 "integration": resolved_integration.key,
                 "branch_numbering": branch_numbering or "sequential",
                 "here": here,
-                "preset": preset,
                 "script": selected_script,
                 "speckit_version": get_speckit_version(),
             }

src/specify_cli/agents.py

@@ -421,6 +421,7 @@ def register_commands(
                 for key in ("scripts", "agent_scripts"):
                     if key not in frontmatter and key in core_frontmatter:
                         frontmatter[key] = core_frontmatter[key]
+                frontmatter.pop("strategy", None)
 
             frontmatter = self._adjust_script_paths(frontmatter)
 
@@ -443,6 +444,8 @@ def register_commands(
                     agent_name, output_name, frontmatter, body, source_id, cmd_file, project_root
                 )
             elif agent_config["format"] == "markdown":
+                body = self.resolve_skill_placeholders(agent_name, frontmatter, body, project_root)
+                body = self._convert_argument_placeholder(body, "$ARGUMENTS", agent_config["args"])
                 output = self.render_markdown_command(frontmatter, body, source_id, context_note)
             elif agent_config["format"] == "toml":
                 body = self.resolve_skill_placeholders(agent_name, frontmatter, body, project_root)