fix: CTO review — version targets, slash command parity, dataclass default

1. pyproject.toml: ruff/mypy target py38→py312, remove 3.8-3.11 classifiers
2. command_suggestions.py: add /branch /commit /commit-push-pr /diff /stash /worktree
3. command_suggestions.py: fix aliases default None → Optional[List[str]]

pkg/hanzo-dev/pyproject.toml

@@ -13,11 +13,8 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Software Development :: Testing",
     "Topic :: Scientific/Engineering :: Artificial Intelligence",
@@ -86,14 +83,14 @@ packages = ["src/hanzo_dev"]
 
 [tool.ruff]
 line-length = 120
-target-version = "py38"
+target-version = "py312"
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "B", "UP", "N", "S", "A", "C4", "T20", "RET", "SIM", "ARG"]
 ignore = ["E501", "S101"]
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.12"
 strict = true
 warn_return_any = true
 warn_unused_configs = true

pkg/hanzo-dev/src/hanzo_dev/command_suggestions.py

@@ -16,7 +16,7 @@ class SlashCommand:
 
     command: str
     description: str
-    aliases: List[str] = None
+    aliases: Optional[List[str]] = None
 
     def matches(self, query: str) -> bool:
         """Check if command matches query."""
@@ -75,12 +75,16 @@ class CommandSuggestions(Vertical):
         SlashCommand("/auth", "Authenticate with Claude personal account"),
         SlashCommand("/auto", "Execute prompt autonomously with tools"),
         SlashCommand("/backend", "Switch AI backend (claude/openai/embedded)"),
-        SlashCommand("/bug", "Submit feedback about Hanzo REPL"),
+        SlashCommand("/branch", "List or create git branches"),
+        SlashCommand("/bug", "Submit feedback about Hanzo Dev"),
         SlashCommand("/clear", "Clear session history and start fresh"),
         SlashCommand("/code", "Implement with consensus from multiple review passes"),
+        SlashCommand("/commit", "Commit staged changes"),
+        SlashCommand("/commit-push-pr", "Commit, push, and create PR"),
         SlashCommand("/compact", "Compact session keeping a summary in context"),
         SlashCommand("/config", "Show loaded configuration files", ["theme"]),
         SlashCommand("/cost", "Show total cost and duration of current session"),
+        SlashCommand("/diff", "Show working tree diff"),
         SlashCommand("/doctor", "Check the health of your Hanzo installation"),
         SlashCommand("/exit", "Exit the REPL", ["quit"]),
         SlashCommand("/export", "Export conversation to file"),
@@ -104,12 +108,14 @@ class CommandSuggestions(Vertical):
         SlashCommand("/resume", "Load saved session from JSON file"),
         SlashCommand("/run", "Run a shell command"),
         SlashCommand("/search", "Search for content using MCP tools"),
+        SlashCommand("/stash", "Manage git stash (pop/list)"),
         SlashCommand("/session", "List or switch saved sessions"),
         SlashCommand("/solve", "Race multiple approaches, present best solution"),
         SlashCommand("/status", "Model, session info, token usage"),
         SlashCommand("/tools", "Show available MCP tools"),
         SlashCommand("/version", "Show version info"),
         SlashCommand("/voice", "Enable voice mode for bidirectional communication"),
+        SlashCommand("/worktree", "Manage git worktrees"),
     ]
 
     selected_index = reactive(0)