fix: implement cljnim compiler recommendations (10 fixes)

- #1: Support docstrings in defn/defn-
- #2: Support multi-arity defn with dispatch by args.len
- #3: (:key map) keyword-as-function syntax (cljGet)
- #4: & rest parameters in defn/defn-
- #5: Nim interop name mangling for nim/ module calls
- #6: getLibPath() checks CLJNIM_LIB_PATH env and cwd first
- #7: Parse :paths from deps.edn
- #8: loop+if/else discard fix with loopResult variable
- #10: emitProgramLib skips when isMainModule guard

src/cljnim.nim

@@ -3,13 +3,18 @@ import os, osproc, strutils, times
 import reader, emitter, types, repl, macros, deps, ai_assist, tui
 
 proc getLibPath(): string =
+  # Check environment variable first
+  let envPath = getEnv("CLJNIM_LIB_PATH", "")
+  if envPath.len > 0 and dirExists(envPath):
+    return envPath
+  # Check current directory's lib first (project-local libs)
+  let candidate0 = getCurrentDir() / "lib"
+  if dirExists(candidate0): return candidate0
   let appDir = getAppDir()
   let candidate1 = appDir / "lib"
   let candidate2 = appDir.parentDir / "lib"
-  let candidate3 = getCurrentDir() / "lib"
   if dirExists(candidate1): return candidate1
   if dirExists(candidate2): return candidate2
-  if dirExists(candidate3): return candidate3
   return "lib"
 
 proc resolveNsToPath(nsName: string, searchPaths: seq[string]): string =