Add docs/STDLIB.md from Claro v1.17.26 zip

docs/STDLIB.md

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+# Claro Standard Library (Commands)
+
+Claro’s “stdlib” is exposed as readable commands.
+
+## TEXT
+
+### Split
+```claro
+TEXT SPLIT "a,b,c" BY "," AS parts
+```
+
+### Join
+```claro
+TEXT JOIN parts BY "-" AS out
+```
+
+### Replace all
+```claro
+TEXT REPLACE "one two two" FROM "two" TO "three" AS out
+```
+
+## PATH
+
+### Dirname
+```claro
+PATH DIRNAME "C:/games/save/file.txt" AS dir
+```
+
+### Normalize
+Unifies slashes and removes `.` / `..` where possible:
+```claro
+PATH NORMALIZE "../data/./levels/../sprites" AS clean
+```
+
+### Is absolute
+```claro
+PATH ISABS "/home/me/file.txt" AS isAbs
+```
+
+### Exists
+Checks if a file exists at the path:
+```claro
+PATH EXISTS "config.json" AS ok
+```
+
+## TIME
+
+### Unix seconds
+```claro
+TIME NOW AS t
+```
+
+### Unix milliseconds (coarse)
+```claro
+TIME NOWMS AS ms
+```