docs: add Addy Osmani 80% problem to Practitioner Insights
Add Addy Osmani (Google Chrome Team) article "The 80% Problem in
Agentic Coding" to AI Ecosystem Practitioner Insights section.
Changes:
- guide/ai-ecosystem.md: Add 32-line entry after Steinberger (~line 2024)
* "80% problem" framework and comprehension debt concept
* Three new failure modes (overengineering, assumption propagation, sycophantic)
* Productivity paradox data (+98% PRs, +91% review time)
* Alignment table mapping to existing guide sections
* Transparent note: "secondary synthesis, primary sources documented"
- machine-readable/reference.yaml: Add 4 new references
* practitioner_addy_osmani, practitioner_osmani_source
* eighty_percent_problem, comprehension_debt_secondary
- docs/resource-evaluations/024-addy-osmani-80-percent-problem.md: Complete evaluation
* Score: 3/5 (Pertinent) - downgraded from initial 4/5 after technical-writer challenge
* Minimal integration (32 lines vs rejected 250 lines)
* Fact-check: 6 stats verified, 1 Stack Overflow stat incorrect
* Rationale: 90% overlap with existing content (Vibe Coding Trap, Trust Calibration)
- CHANGELOG.md: Document addition in v3.19.0
Decision: Minimal integration approach chosen to avoid duplication while
recognizing value of synthesis from respected author. Article aggregates
existing research already cited in guide with primary sources.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>