docs: complete Perceptron 1958 standardization and add tito dev CLI docs

- Update remaining 1957→1958 references across all documentation
- Add tito dev commands (preflight, export, validate) to CLI reference
- Update CLI validation script to recognize new dev subcommands
- Fix milestone year references in tests and workflow code
- Update timeline visualization JavaScript

This completes the Perceptron year standardization to align with
the publication year and academic citation format (rosenblatt1958perceptron).

Cherry-picked from: ebf3fb17b (feature/tito-dev-validate)

tinytorch/tools/dev/validate_cli_docs.py

@@ -36,7 +36,7 @@ VALID_COMMANDS: Dict[str, List[str]] = {
     "logo": [],  # No subcommands
     "system": ["info", "health", "jupyter", "update", "logo"],
     "module": ["start", "view", "resume", "complete", "test", "reset", "status", "list"],
-    "dev": ["preflight"],
+    "dev": ["preflight", "export", "validate"],
     "src": ["export", "test"],
     "package": ["reset", "nbdev"],
     "nbgrader": ["init", "generate", "release", "collect", "autograde", "feedback", "status", "analytics", "report"],