feat: Add research-assistant skill for proactive vault context

[rjroy]

Summary

• Adds new research-assistant skill that changes Claude's behavior to proactively search the vault for relevant context during conversation
• Activates on explicit request ("/research", "research mode") or inferred from conversation patterns (person/project names, timeframes, "help me think through")
• Aligned with GCTR philosophy: AI fetches context to support user synthesis, doesn't conclude for them

Implementation

Purely instruction-based skill (no code changes needed):

• SKILL.md (~280 lines) teaches Claude when to activate and how to behave
• Uses existing tools (Grep, Glob, Read) for searching
• Session persistence via conversation context

Key Behaviors

When active, Claude will:

• Search vault proactively when topics come up
• Quote relevant passages with file citations
• Present findings without interpreting them
• Focus on recent and relevant content

Test plan

• Run ./git-hooks/pre-commit.sh (all checks pass)
• Start dev server with bun run dev
• In Discussion mode, test explicit activation: "/research" or "research mode"
• Test inferred activation: "help me think through what happened this week"
• Verify Claude searches vault proactively and cites sources
• Test deactivation: "stop researching" or "be less aggressive"

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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