story-kit: accept 179_story_add_configurable_chat_history_pruning

.story_kit/work/5_done/178_story_fix_chat_textarea_input_lag.md

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-name: "Fix chat textarea input lag"
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-
-# Story 178: Fix chat textarea input lag
-
-## User Story
-
-As a user, I want typing in the chat input to feel responsive, so that I can compose messages without frustrating delays.
-
-## Acceptance Criteria
-
-- [ ] Extract ChatInput as a separate component that owns its own input state, only calling parent on submit
-- [ ] Wrap calculateContextUsage in useMemo so it doesn't recompute on every keystroke
-- [ ] Extract MessageItem as a React.memo component so individual messages skip re-render on unrelated state changes
-- [ ] Typing in the textarea does not trigger re-render of the message list
-
-## Out of Scope
-
-- TBD

.story_kit/work/5_done/179_story_add_configurable_chat_history_pruning.md

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-name: "Add configurable chat history pruning"
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-
-# Story 179: Add configurable chat history pruning
-
-## User Story
-
-As a user, I want chat history to be automatically pruned to a configurable limit, so that long sessions don't bloat localStorage and degrade performance.
-
-## Acceptance Criteria
-
-- [ ] Default limit of 200 messages is applied when saving to localStorage
-- [ ] Messages are pruned from the front (oldest removed first) via messages.slice(-limit)
-- [ ] Limit is configurable via localStorage key storykit-chat-history-limit:{projectPath}
-- [ ] A limit of 0 means unlimited (no pruning)
-- [ ] useChatHistory returns maxMessages and setMaxMessages for future UI use
-- [ ] Existing useChatHistory tests continue to pass
-- [ ] New tests cover: pruning at limit, custom limit, unlimited mode
-
-## Out of Scope
-
-- TBD