docs: qualify README claims for intellectual honesty

[abrichr]

Summary

This PR adds qualifiers to claims in the README to ensure intellectual honesty, per the publication roadmap.

Changes:

• Change "Core Innovation" to "Core Approach" (more accurate positioning)
• Change "key differentiator" to "explores" (less marketing language)
• Correct accuracy figure (46.7% -> 100%, not 33% -> 100%)
• Add context that all 45 tasks in the benchmark share the same navigation entry point
• Link to publication roadmap for methodology and limitations
• Change "No technical expertise needed" to "Reduced prompt engineering" (more accurate)

Rationale

The goal is accuracy over marketing appeal. Per the publication roadmap:

• The demo-conditioning result is valid but has specific scope
• Claims should be defensible to a skeptical reviewer
• Better to be accurate than to oversell

Test plan

• README renders correctly
• Link to publication roadmap is valid (relative link)
• Claims align with documented evidence

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