feat: bridge_self bot commands — status, thresholds, reset, health

Adds bot commands for the bridge_self provider so operators can inspect
and manage bridge health from chat: /status, /thresholds, /reset, /health.
Includes Jinja2 templates for both locales, seed data, capability slots,
and a handler that exposes pending deferred backlog plus per-counter
reset. Also adds .claude/skills/ for project-scoped graph-aware skills.

.claude/skills/explore-codebase.md

@@ -0,0 +1,28 @@
+---
+name: Explore Codebase
+description: Navigate and understand codebase structure using the knowledge graph
+---
+
+## Explore Codebase
+
+Use the code-review-graph MCP tools to explore and understand the codebase.
+
+### Steps
+
+1. Run `list_graph_stats` to see overall codebase metrics.
+2. Run `get_architecture_overview` for high-level community structure.
+3. Use `list_communities` to find major modules, then `get_community` for details.
+4. Use `semantic_search_nodes` to find specific functions or classes.
+5. Use `query_graph` with patterns like `callers_of`, `callees_of`, `imports_of` to trace relationships.
+6. Use `list_flows` and `get_flow` to understand execution paths.
+
+### Tips
+
+- Start broad (stats, architecture) then narrow down to specific areas.
+- Use `children_of` on a file to see all its functions and classes.
+- Use `find_large_functions` to identify complex code.
+
+## Token Efficiency Rules
+- ALWAYS start with `get_minimal_context(task="<your task>")` before any other graph tool.
+- Use `detail_level="minimal"` on all calls. Only escalate to "standard" when minimal is insufficient.
+- Target: complete any review/debug/refactor task in ≤5 tool calls and ≤800 total output tokens.