Harness Explorer v0.5.0

Major release renaming the project from 'Instruction Hierarchy Explorer' (ihe)
to 'Harness Explorer' (he), reflecting industry terminology convergence
(Microsoft VS Code, promptfoo, PrimeIntellect).

BREAKING CHANGES:
- Binary: ihe → he
- Go module: gitlab.com/andunn/ihe → gitlab.com/andunn/he
- Container: ENTRYPOINT changed to 'he'
- Update any scripts or aliases referencing the old name

NEW METRICS (research-backed, all local/offline):

1. Position Importance Score
   - Measures instruction density in first/last 10% vs middle 80%
   - Based on 'Lost in the Middle' (arXiv:2307.03172)
   - Score >2.0 indicates good structure; ~1.0 means flat distribution

2. Negative Constraint Ratio
   - Ratio of NEVER/AVOID/PROHIBITED vs MUST/ALWAYS/SHOULD
   - Based on Claude's Character research
   - Balanced ratio (~0.3-0.5) suggests healthy constraint mix

3. Hedging Density
   - Frequency of hedging words (might, could, perhaps, generally)
   - Based on RLHF Length Bias research (arXiv:2310.03716)
   - Lower = more direct, actionable instructions

4. Specificity Gradient
   - Positive reframe of inheritance_violation (1 - score)
   - Higher = children differentiate well from parents

5. Boilerplate Lead Score
   - Detects files starting with generic intros vs substance
   - Based on Attention Sinks research (arXiv:2410.13835)
   - Higher = more files lead with important content

UI IMPROVEMENTS:
- Three-column metrics dashboard with logical groupings
- Color-coded quality indicators (green/amber/red dots)
- Progress bars showing relative metric values
- Hover tooltips explaining each metric's meaning

OTHER CHANGES:
- Auto-detect .gitlab/duo/skills directory (GitLab Duo)
- Auto-detect .cursor/rules directory (Cursor IDE)
- CI creates proper GitLab Release with binary download links
- Project logo added (assets/he.png, LFS tracked)
- Unit tests for new metric functions

INSTALLATION:
  curl -L https://gitlab.com/andunn/he/-/releases/v0.5.0/downloads/he-darwin-arm64 -o he
  chmod +x he

CONTAINER:
  docker run --rm -v $(pwd):/work -p 8765:8765 registry.gitlab.com/andunn/he:v0.5.0