docs: add sonnet workforce loop documentation (Refs #260)

docs/sonnet-workforce.md

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+# Sonnet Workforce Loop
+
+## Agent
+- **Agent:** Sonnet (Claude Sonnet)
+- **Model:** claude-sonnet-4-6 via Anthropic Max subscription
+- **CLI:** claude -p with --model sonnet --dangerously-skip-permissions
+- **Loop:** ~/.hermes/bin/sonnet-loop.sh
+
+## Purpose
+Burn through sonnet-only quota limits on real Gitea issues.
+
+## Dispatch
+1. Polls Gitea for assigned-sonnet or unassigned issues
+2. Clones repo, reads issue, implements fix
+3. Commits, pushes, creates PR
+4. Comments issue with PR URL
+5. Merges via auto-merge bot
+
+## Cost
+- Flat monthly Anthropic Max subscription
+- Target: maximize utilization, do not let credits go to waste