docs: update documentation to match current implementation

- SKILLS.md: Update roadmap phases with actual completion status
  - Phase 0-1 complete, Phase 2-5 partial, resolved design decisions
- OVERVIEW.md: Add HttpServer, Test effect, JIT to completed features
- ROADMAP.md: Add HttpServer, Process, Test effects to done list
- VISION.md: Update Phase 2-3 tables with current status
- guide/05-effects.md: Add Time, HttpServer, Test to effects table
- guide/09-stdlib.md: Add HttpServer, Time, Test effect docs
- reference/syntax.md: Fix interpolation syntax, remove unsupported literals
- testing.md: Add native Test effect documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/guide/09-stdlib.md

@@ -260,6 +260,34 @@ fn example(): Unit with {Http} = {
 }
 ```
 
+### HttpServer
+
+```lux
+fn example(): Unit with {HttpServer, Console} = {
+    HttpServer.listen(8080)              // Start server on port
+    Console.print("Server listening on port 8080")
+
+    let req = HttpServer.accept()        // Wait for request
+    // req is { method: String, path: String, body: String, headers: List<(String, String)> }
+
+    Console.print("Got " + req.method + " " + req.path)
+    HttpServer.respond(200, "Hello, World!")  // Send response
+
+    HttpServer.stop()                    // Stop server
+}
+```
+
+### Time
+
+```lux
+fn example(): Unit with {Time, Console} = {
+    let start = Time.now()       // Current timestamp (milliseconds)
+    Time.sleep(1000)             // Sleep for 1 second
+    let elapsed = Time.now() - start
+    Console.print("Elapsed: " + toString(elapsed) + "ms")
+}
+```
+
 ### Random
 
 ```lux
@@ -292,6 +320,24 @@ fn example(): Int with {Fail} = {
 }
 ```
 
+### Test
+
+Native testing framework:
+
+```lux
+fn runTests(): Unit with {Test, Console} = {
+    Test.assert(1 + 1 == 2, "basic math")
+    Test.assertEqual(List.length([1,2,3]), 3, "list length")
+    Test.assertTrue(String.contains("hello", "ell"), "contains check")
+    Test.assertFalse(List.isEmpty([1]), "non-empty list")
+}
+
+// Run with test handler
+fn main(): Unit with {Console} = {
+    run runTests() with { Test = testReporter }
+}
+```
+
 ## Quick Reference
 
 | Module | Key Functions |
@@ -309,9 +355,12 @@ fn example(): Int with {Fail} = {
 | File | read, write, exists, list, mkdir, delete |
 | Process | exec, env, args, cwd, exit |
 | Http | get, post, put, delete |
+| HttpServer | listen, accept, respond, stop |
+| Time | now, sleep |
 | Random | int, float, bool |
 | State | get, put |
 | Fail | fail |
+| Test | assert, assertEqual, assertTrue, assertFalse |
 
 ## Next