# Octave Validation Tokenization Bug

## Problem Description
The Octave validation tool is throwing a consistent and unexpected tokenization error across multiple input files. Specifically:
- Error Code: E005
- Location: Line 3, Column 15
- Error Message: Unexpected character: '.'

## Detailed Investigation
I conducted a systematic investigation using multiple test files with varying structures:
1. Simple metadata file
2. Nested structure file
3. Different value types file
4. Special characters file

In ALL cases, the exact same error was produced.

## Reproduction Steps
1. Use the attached `validate_octave.py` script
2. Run against the test files in `.hestai/octave-validation-tests/`

## Test Files
Test files demonstrate the issue across different input styles:
- simple-test.oct.md
- nested-structure.oct.md
- value-types.oct.md
- special-chars.oct.md

## Potential Causes
Possible sources of the error:
1. Overly restrictive lexer rules
2. Unexpected constraint on character usage
3. Bug in tokenization logic
4. Unintended parsing constraint

## Recommended Actions
1. Review lexer source code (`/octave_mcp/core/lexer.py`)
2. Validate character restriction logic
3. Create comprehensive test suite to map parsing constraints

## Context
- Python Version: 3.12
- Octave MCP Version: (detected during investigation)
- Platform: macOS

## Additional Notes
The consistent error location and message suggest a systematic parsing issue rather than content-specific problems.
