docs(atlas): document V6 dry-run flags and ETA display

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: cloudbridgeuy

.claude/context/atlas.md

@@ -34,8 +34,12 @@ mcptools atlas update                 # Incremental update (changed files only)
 mcptools atlas sync                   # Force full re-index
 mcptools atlas status                 # Index health summary
 mcptools atlas status --json          # JSON output
+mcptools atlas index --dry-run        # Show what would be indexed (by tier)
+mcptools atlas update --dry-run       # Show what would change (adds/mods/deletes)
 ```
 
+The `index` and `update` commands display ETA and elapsed time during LLM description phases, and print total elapsed time on completion.
+
 ### `atlas init` Workflow
 
 1. Opens `$VISUAL` / `$EDITOR` with a primer template (questions about the project)

CLAUDE.md

@@ -95,6 +95,8 @@ mcptools atlas peek <path>            # Show file or directory summary + symbols
 mcptools atlas update                 # Incremental update (changed files only)
 mcptools atlas sync                   # Force full re-index
 mcptools atlas status                 # Index health (--json)
+mcptools atlas index --dry-run        # Show what would be indexed
+mcptools atlas update --dry-run       # Show what would change
 ```
 
 ### Jira