agent update

.pi/agent/skills/wgsl/SKILL.md

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+# WGSL Shader Development
+
+Reference for WGSL shader development, buffer alignment, uniform struct layout, and shader asset management. Load this skill when working on shader code, graphics pipelines, or buffer alignment issues.
+
+## WGSL Uniform Buffer Alignment
+
+When creating uniform buffers for WGSL shaders, struct fields must be aligned:
+
+| Type | Alignment |
+|------|-----------|
+| `f32` | 4 bytes |
+| `vec2<f32>` | 8 bytes |
+| `vec3<f32>` | 16 bytes (treated as vec4) |
+| `vec4<f32>` | 16 bytes |
+| `mat4x4<f32>` | 16 bytes (64 bytes total) |
+
+Use padding fields to match WGSL struct layout exactly. Prefer `vec4` over individual floats to avoid alignment issues.
+
+## Shader Organization
+
+Shaders live in `src/shaders/` and are embedded via `include_str!()`.

.pi/agents/diagnostics.md

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+---
+name: diagnostics
+description: Run cargo check and return a filtered, concise list of errors and warnings. Use this after making code changes to verify correctness before proceeding. Pass a file path or module name to focus the output, or leave args empty for a full check.
+model: claude-haiku-4-5-20251001
+tools:
+  - Bash
+  - Read
+  - Grep
+---
+
+You are a Rust diagnostics agent for the Snow Trail project. Run `cargo check` and return only the signal — errors first, then warnings, filtered to what's actionable.
+
+## Steps
+
+1. Run `cargo check 2>&1` (always capture stderr).
+2. If the caller specified a file or module, filter output to diagnostics in or caused by that file.
+3. For each error: include the error code, message, and `file:line` location. Skip "aborting due to N errors" lines.
+4. For warnings: include only `unused_imports`, `dead_code`, and `unused_variables` that are in files the caller is working on. Skip generated code and files the caller didn't touch.
+5. If there are no errors and no relevant warnings, say so in one line.
+
+## Output format
+
+```
+ERRORS (N):
+  E0XXX file:line — message
+
+WARNINGS (N):
+  file:line — category — message
+```
+
+Do not include raw cargo output. Do not explain Rust concepts. Do not suggest fixes unless asked.

.pi/hooks/filter-cargo-warnings.py

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+#!/usr/bin/env python3
+import sys
+import json
+import re
+
+data = json.load(sys.stdin)
+
+if data.get("tool_name") != "Bash":
+    sys.exit(0)
+
+cmd = data.get("tool_input", {}).get("command", "")
+if not re.search(r"\bcargo\s+(check|build|test|clippy|run)\b", cmd):
+    sys.exit(0)
+
+output = data.get("tool_response", {}).get("output", "")
+if not output:
+    sys.exit(0)
+
+blocks = re.split(r"\n{2,}", output)
+warning_blocks = [b for b in blocks if re.match(r"\s*warning:", b)]
+other_blocks = [b for b in blocks if not re.match(r"\s*warning:", b)]
+
+if not warning_blocks:
+    sys.exit(0)
+
+filtered = "\n\n".join(other_blocks).rstrip("\n")
+filtered += f"\n\n[{len(warning_blocks)} warning(s) filtered]\n"
+
+print(json.dumps({"type": "result", "content": filtered}))

.pi/settings.local.json

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+{
+  "permissions": {
+    "allow": [
+      "Bash(cargo check:*)",
+      "Bash(cargo build:*)",
+      "Bash(cargo fmt:*)",
+      "Bash(head:*)",
+      "mcp__plugin_qmd_qmd__deep_search",
+      "mcp__plugin_qmd_qmd__query",
+      "mcp__opty__opty_status",
+      "mcp__opty__opty_query",
+      "mcp__opty__opty_ast",
+      "Bash(cargo search:*)",
+      "Bash(cargo info:*)"
+    ]
+  },
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python3 \"$CLAUDE_PROJECT_DIR/.claude/hooks/filter-cargo-warnings.py\""
+          }
+        ]
+      }
+    ]
+  }
+}