Promote _rewrite_project_relative_paths to public API

Rename CommandRegistrar._rewrite_project_relative_paths() to
rewrite_project_relative_paths() (drop leading underscore) so
integrations can call it without reaching into a private method
across subsystem boundaries.

Addresses PR review feedback:
#2038 (comment)

Author: mnriem

src/specify_cli/agents.py

@@ -241,11 +241,11 @@ def _adjust_script_paths(self, frontmatter: dict) -> dict:
 
             for key, script_path in scripts.items():
                 if isinstance(script_path, str):
-                    scripts[key] = self._rewrite_project_relative_paths(script_path)
+                    scripts[key] = self.rewrite_project_relative_paths(script_path)
         return frontmatter
 
     @staticmethod
-    def _rewrite_project_relative_paths(text: str) -> str:
+    def rewrite_project_relative_paths(text: str) -> str:
         """Rewrite repo-relative paths to their generated project locations."""
         if not isinstance(text, str) or not text:
             return text
@@ -428,7 +428,7 @@ def resolve_skill_placeholders(agent_name: str, frontmatter: dict, body: str, pr
             body = body.replace("{AGENT_SCRIPT}", agent_script_command)
 
         body = body.replace("{ARGS}", "$ARGUMENTS").replace("__AGENT__", agent_name)
-        return CommandRegistrar._rewrite_project_relative_paths(body)
+        return CommandRegistrar.rewrite_project_relative_paths(body)
 
     def _convert_argument_placeholder(self, content: str, from_placeholder: str, to_placeholder: str) -> str:
         """Convert argument placeholder format.

src/specify_cli/integrations/base.py

@@ -350,7 +350,7 @@ def process_template(
         #    CommandRegistrar so extension-local paths are preserved and
         #    boundary rules stay consistent across the codebase.
         from specify_cli.agents import CommandRegistrar
-        content = CommandRegistrar._rewrite_project_relative_paths(content)
+        content = CommandRegistrar.rewrite_project_relative_paths(content)
 
         return content
 

tests/test_extensions.py

@@ -981,7 +981,7 @@ def test_rewrite_project_relative_paths_preserves_extension_local_body_paths(sel
             "Run scripts/bash/setup-plan.sh\n"
         )
 
-        rewritten = AgentCommandRegistrar._rewrite_project_relative_paths(body)
+        rewritten = AgentCommandRegistrar.rewrite_project_relative_paths(body)
 
         assert ".specify/extensions/test-ext/templates/spec.md" in rewritten
         assert ".specify/scripts/bash/setup-plan.sh" in rewritten