feat(commands): add /challenge and /emerge thinking tool commands

- Add .claude/commands/challenge.md: pressure-tests beliefs by finding
  contradictions and counter-evidence within vault notes
- Add .claude/commands/emerge.md: surfaces hidden patterns and unstated
  ideas implied by the vault's collective content
- Update my-commands.md with descriptions and usage for both commands

vin-obsidian-workflows/.claude/commands/challenge.md

@@ -0,0 +1,24 @@
+Pressure-test my beliefs using my vault's own history.
+
+1. Read all vault notes:
+   - @my-vault/The Junior Employee Mental Model.md
+   - @my-vault/Plan Mode.md
+   - @my-vault/CLAUDE.md Best Practices.md
+   - @my-vault/Context Window Management.md
+   - @my-vault/The Verification Loop.md
+   - @my-vault/Subagents.md
+   - @my-vault/Custom Commands.md
+   - @my-vault/Hooks.md
+   - @my-vault/The Death Spiral.md
+   - @my-vault/Voice-First Workflows.md
+
+2. Run these CLI commands to find strong claims:
+   - `obsidian backlinks file="The Death Spiral"`
+   - `obsidian search query="never"`
+
+3. Find contradictions, tensions, and counter-evidence WITHIN my own notes. Where do I say one thing in one note and something different in another? Where are my blind spots?
+
+4. Output format:
+   - **Tension Found**: [description]
+   - **Evidence from notes**: [specific quotes with note names]
+   - **The challenge**: [question that forces me to reconcile]

vin-obsidian-workflows/.claude/commands/emerge.md

@@ -0,0 +1,24 @@
+Surface hidden patterns — ideas my vault implies but I never explicitly stated.
+
+1. Read all vault notes:
+   - @my-vault/The Junior Employee Mental Model.md
+   - @my-vault/Plan Mode.md
+   - @my-vault/CLAUDE.md Best Practices.md
+   - @my-vault/Context Window Management.md
+   - @my-vault/The Verification Loop.md
+   - @my-vault/Subagents.md
+   - @my-vault/Custom Commands.md
+   - @my-vault/Hooks.md
+   - @my-vault/The Death Spiral.md
+   - @my-vault/Voice-First Workflows.md
+
+2. Run these CLI commands to find neglected areas:
+   - `obsidian orphans`
+   - `obsidian tags counts`
+
+3. Look for: conclusions from scattered premises, unnamed patterns across notes, themes I circle around but never articulate, unarticulated directions my thinking is heading.
+
+4. Output format:
+   - **Emergent Pattern**: [description]
+   - **Evidence trail**: [which notes contribute to this pattern]
+   - **The unstated idea**: [what my notes imply but I never wrote down]

vin-obsidian-workflows/my-commands.md

@@ -13,3 +13,15 @@ Loads personal context from the vault in one shot. Reads all 10 vault notes, run
 Finds unexpected bridges between two seemingly unrelated notes in the vault. Reads all vault notes, traces backlinks via CLI, then surfaces a hidden connection and explains what it means.
 
 **Use it:** When you want to spark new thinking by combining two domains you haven't consciously linked.
+
+## /challenge
+
+Pressure-tests your beliefs using your vault's own history. Finds contradictions, tensions, and counter-evidence within your own notes by searching for strong claims and tracing backlinks to conflicting ideas.
+
+**Use it:** When you want to stress-test an assumption or find where your thinking has shifted.
+
+## /emerge
+
+Surfaces hidden patterns — ideas your vault implies but you never explicitly stated. Finds conclusions from scattered premises, unnamed patterns, and unarticulated directions your thinking is heading.
+
+**Use it:** When you want to discover what your notes know that you don't.