The `tito src` command was never implemented. All documentation
references have been updated to use the correct commands:
- `tito src export` → `tito dev export`
- `tito src test` → `tito dev test`
Also removed 'src' from developer_commands list in main.py since
it doesn't exist as a registered command.
- Replace deprecated tito dev validate with tito dev test flags
- Add all test type commands to Developer Commands table
- Update Developer Workflow section with testing examples
- Add link to new Developer Testing Guide
- 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)
- Update all repository references to point to harvard-edge/cs249r_book
- Fix Binder URLs to include tinytorch/ path prefix
- Fix Colab URLs to include tinytorch/ path prefix
- Update marimo-badges.js with correct repo and path
- Fix dataset documentation URLs
- Update module ABOUT.md files with correct source links
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