docs: add initial anonymized discovery evidence

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Summary

• add four anonymized prior exploratory interview summaries
• separate exploratory signals from decision-gate patterns
• document contradictions, inference boundaries, and eligibility gaps
• record D001: keep the current v0.1.0 product scope unchanged

Evidence boundary

• all interview evidence is Self-reported
• 0 interviews are fully eligible under the current protocol
• 0 external participants, observed workflows, ARI concept tests, or pilots
• H1-H4 remain Unvalidated
• no README, resume, product feature, or release claim changes

Verification

• Markdown checks: 0 issues
• focused automated tests: 52 passed
• privacy/evidence assertions: passed
• independent review: no remaining findings