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/05-effects.md

@@ -48,9 +48,12 @@ Lux provides several built-in effects:
 | `Fail` | `fail` | Early termination |
 | `State` | `get`, `put` | Mutable state |
 | `Random` | `int`, `float`, `bool` | Random numbers |
-| `File` | `read`, `write`, `exists` | File system |
-| `Process` | `exec`, `env`, `args` | System processes |
+| `Time` | `now`, `sleep` | Time operations |
+| `File` | `read`, `write`, `exists`, `delete`, `list`, `mkdir` | File system |
+| `Process` | `exec`, `env`, `args`, `cwd`, `exit` | System processes |
 | `Http` | `get`, `post`, `put`, `delete` | HTTP client |
+| `HttpServer` | `listen`, `accept`, `respond`, `stop` | HTTP server |
+| `Test` | `assert`, `assertEqual`, `assertTrue`, `assertFalse` | Testing |
 
 Example usage: