docs: update documentation for May 12 compiler fixes

- CLJNIM_RECOMMENDATIONS.md: mark all 12 recommendations as implemented
- README.md: add --lib-path, first-class functions, multi-arity, rest params
- User guides (EN/BG): add sections for docstrings, multi-arity, rest params,
  keyword-as-function, first-class functions, loop/recur, --lib-path flag
- TASKS.md: add Phase 11 with all BRing compiler fixes

README.md

@@ -58,6 +58,7 @@ Hello, native world!
 | 🇬🇧 English | [docs/en/index.md](docs/en/index.md) | Getting started, architecture, AI integration, API reference |
 | 🇧🇬 Български | [docs/bg/index.md](docs/bg/index.md) | Първи стъпки, архитектура, AI интеграция, API справочник |
 | 🧪 Test Suite | [docs/en/07-clojure-test-suite.md](docs/en/07-clojure-test-suite.md) | Cross-dialect compliance with [jank-lang/clojure-test-suite](https://github.com/jank-lang/clojure-test-suite) |
+| 🛠️ Recommendations | [CLJNIM_RECOMMENDATIONS.md](CLJNIM_RECOMMENDATIONS.md) | Compiler limitations, workarounds, and fixes (Bulgarian) |
 
 ## ✨ What Makes This Unique?
 
@@ -127,6 +128,11 @@ No JNI, no JVM bridging, no Java interop overhead.
 | AI integration (DeepSeek, OpenAI, MiMo) | ✅ |
 | Cross-compilation targets (JS, WASM, shared libs) | ✅ |
 | Self-hosted REPL with tree-walking interpreter | ✅ |
+| First-class functions (defn as values) | ✅ |
+| Multi-arity `defn` | ✅ |
+| `&` rest parameters | ✅ |
+| Keyword-as-function `(:key map)` | ✅ |
+| `--lib-path` CLI flag + `CLJNIM_LIB_PATH` | ✅ |
 | 276+ unit tests | ✅ |
 | [jank-lang/clojure-test-suite](https://github.com/jank-lang/clojure-test-suite) compliance | ✅ |
 
@@ -192,6 +198,12 @@ make build
 ./cljnim --help
 ```
 
+### Custom Library Path
+Use `--lib-path` to point to your project's Nim runtime libraries:
+```bash
+./cljnim --lib-path ./my_project/lib run app.clj
+```
+
 ## 🏗️ Architecture
 
 ```