docs: Documentation for the RESTful API POC

docs/restful-api/testing/plans/13-completions-and-prompt.md

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+# Test Plan: Tab Completion and Prompt
+
+## Behaviors to test
+
+### Tab completion (repl_complete)
+- [ ] .role<TAB> → role names (no hidden files)
+- [ ] .agent<TAB> → agent names (no .shared)
+- [ ] .session<TAB> → session names
+- [ ] .rag<TAB> → RAG names
+- [ ] .macro<TAB> → macro names
+- [ ] .model<TAB> → model names with descriptions
+- [ ] .set <TAB> → setting keys (sorted)
+- [ ] .set temperature <TAB> → current value suggestions
+- [ ] .set enabled_tools <TAB> → tool names (no internal tools)
+- [ ] .set enabled_mcp_servers <TAB> → configured servers + aliases
+- [ ] .delete <TAB> → type names
+- [ ] .vault <TAB> → subcommands
+- [ ] .agent <name> <TAB> → session names for that agent
+- [ ] Fuzzy filtering applied to all completions
+
+### Prompt rendering
+- [ ] Left prompt shows role/session/agent name
+- [ ] Right prompt shows model name
+- [ ] Prompt updates after scope transitions
+- [ ] Multi-line indicator shown during ::: input
+
+## Status
+Most completion logic requires filesystem access for role/session/agent lists.
+The `split_line` function has existing tests. Prompt rendering methods are trivial
+wrappers around stored strings. Low additional unit-test yield.
+
+## Old code reference
+- `src/config/request_context.rs` — repl_complete
+- `src/repl/completer.rs` — ReplCompleter (split_line already tested)
+- `src/repl/prompt.rs` — ReplPrompt