story-kit: create 285_story_matrix_bot_help_command_lists_available_bot_commands

.story_kit/work/1_upcoming/285_story_matrix_bot_help_command_lists_available_bot_commands.md

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+---
+name: "Matrix bot help command lists available bot commands"
+---
+
+# Story 285: Matrix bot help command lists available bot commands
+
+## User Story
+
+As a user in a Matrix room, I want to type "{bot_name} help" and get a list of all available bot commands with brief descriptions, so that I can discover what the bot can do without having to ask or remember.
+
+## Acceptance Criteria
+
+- [ ] Chat command "{bot_name} help" displays a list of all available bot-level commands (bot name comes from display_name in bot.toml)
+- [ ] Each command is shown with a short description of what it does
+- [ ] Help output is formatted for readability in Matrix
+- [ ] Help command is handled at the bot level — does not require a full Claude invocation
+- [ ] Help list automatically includes new commands as they are added (driven by a registry or similar, not a hardcoded string)
+
+## Out of Scope
+
+- TBD