Render prompts according to the agent interface

Prompt parameters (available tools/markers and the tool name mapping) are now computed per agent
interface (SerenaAgent.PromptParams). In REPL mode, the available tools comprise the exposed tools
and the enabled facade methods, and the tool name mapping resolves tool names to the qualified names
of the corresponding facade methods (e.g. `lsp.find_symbol`), such that prompts refer to operations
as they are used in REPL code. The parameters are re-computed whenever the active tools change.

FacadeMethod refers to its parent facade and provides facade_name and qualified_name; its name is
taken from its info. Prompt templates use the tool name mapping consistently (fixing a template
syntax error in the editing mode) and use interface-neutral wording.

test/serena/test_serena_agent.py

@@ -918,6 +918,11 @@ class TestSerenaAgent:
             expected = {"serena_repl", "initial_instructions"} | (set() if context.single_project else {"activate_project"})
             assert exposed == expected
             assert "s.lsp" in agent.get_tool(SerenaReplTool).apply("s.info()")
+
+            # prompts refer to operations by their qualified REPL names, e.g. `lsp.find_symbol` instead of the tool name
+            system_prompt = agent.create_system_prompt()
+            assert "`lsp.find_symbol`" in system_prompt
+            assert "`find_symbol`" not in system_prompt
         finally:
             agent.on_shutdown(timeout=5)