/insights: qualitative sections empty — facets generation silently fails

Bug Description

Running /insights generates a report with all quantitative sections populated (tool usage, languages, time-of-day, multi-clauding, errors) but all qualitative/narrative sections are empty or show "No data."

Affected Sections

These sections in the generated report.html are empty:

• "What You Wanted" chart — "No data"
• "Session Types" chart — "No data"
• "What Helped Most (Claude's Capabilities)" — "No data"
• "Outcomes" — "No data"
• "Primary Friction Types" — "No data"
• "Inferred Satisfaction" — "No data"
• At a Glance summary — missing entirely from HTML
• Project Areas — missing
• Wins / Big Wins — missing
• Friction details — missing
• Features to Try — missing
• New Usage Patterns — missing
• On the Horizon — missing
• Team Feedback — missing

Working Sections

Quantitative sections render correctly:

• Top-level stats (messages, lines, files, days)
• Top Tools Used (with counts)
• Languages breakdown
• User Messages by Time of Day
• Multi-Clauding (parallel sessions)
• Tool Errors Encountered
• User Response Time Distribution

Root Cause Investigation

The facets/ directory (referenced by the insights output) does not exist. The pipeline appears to be:

1. Session metadata → ~/.claude/usage-data/session-meta/ — ✅ 165 JSON files present with quantitative data (tool_counts, languages, git_commits, tokens, response_times, first_prompt, etc.)
2. Facets generation (LLM analysis of session metadata → qualitative summaries) → ~/.claude/usage-data/facets/ — ❌ Directory never created
3. Report generation (facets + raw data → HTML) → ~/.claude/usage-data/report.html — ⚠️ Partially generated (only raw data sections)

The facets generation step is silently failing. No error is reported to the user — the command completes normally and shows the report link.

Expected Behavior

• Either populate the qualitative sections, or
• Surface an error message explaining why they couldn't be generated (e.g., token budget exceeded, LLM call failed, timeout)

Environment

• Claude Code model: claude-opus-4-6
• Platform: Windows 11 (Git Bash)
• Sessions: 195 total, 148 analyzed, 2,876 messages over 25 days
• Session metadata files: 165
• Ran /insights multiple times with the same result each time

Reproduction

1. Have a substantial session history (~150+ sessions)
2. Run /insights
3. Observe that quantitative charts render but narrative sections are all empty
4. Check ~/.claude/usage-data/facets/ — directory does not exist