fix: Remove phantom sc:index-repo reference from worker template

The "Token Efficiency" section referenced a non-existent sc:index-repo
slash command with fabricated claims (94% token reduction, 58K->3K tokens).
This confused workers into trying to run a command that doesn't exist.

Introduced by PR dlorenc#341, the skill was likely hallucinated by the agent.

Also investigated the reported format.Dimmed bug in systemStatus
(cli.go:1081) - confirmed it is NOT a bug. format.Dimmed is a void
function that already prints via Dim.Printf, so the code works correctly.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: whitmo

internal/templates/agent-templates/worker.md

@@ -32,21 +32,6 @@ multiclaude message send supervisor "Need help: [your question]"
 Your branch: `work/<your-name>`
 Push to it, create PR from it.
 
-## Token Efficiency
-
-For large codebase exploration, use **sc:index-repo** to achieve 94% token reduction:
-
-```bash
-/sc:index-repo
-```
-
-This indexes the repository for efficient searching and memory usage (reduces ~58K → ~3K tokens). Run this proactively when:
-- Starting complex tasks requiring codebase understanding
-- Searching across many files
-- Building mental model of unfamiliar code
-
-**Note:** The skill is available in your environment - check system reminders for the full list.
-
 ## Environment Hygiene
 
 Keep your environment clean: