story-kit: create 312_bug_auto_assign_assigns_mergemaster_to_coding_stage_stories

.story_kit/work/1_backlog/307_story_configurable_coder_pool_size_and_default_model_in_project_toml.md

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----
-name: "Configurable coder pool size and default model in project.toml"
-agent: coder-opus
----
-
-# Story 307: Configurable coder pool size and default model in project.toml
-
-## User Story
-
-As a project owner, I want to configure the number of concurrent coder agents and their default model in project.toml, so that I can control resource usage and cost while still being able to override per-story when needed.
-
-## Acceptance Criteria
-
-- [ ] New project.toml setting: default_coder_model (e.g. 'sonnet') determines which model is used for coder agents by default
-- [ ] New project.toml setting: max_coders (e.g. 3) limits concurrent coder agent slots
-- [ ] Add one more sonnet coder to the agent config (coder-3) for a total of 3 sonnet coders
-- [ ] When all coder slots are full, new stories wait in current until a slot frees up
-- [ ] Per-story front matter agent field still overrides the default (e.g. agent: coder-opus assigns opus)
-- [ ] Opus coders are only used when explicitly requested via front matter
-- [ ] QA and mergemaster limits are unchanged (not configurable via this story)
-- [ ] auto_assign_available_work respects the max_coders limit
-
-## Out of Scope
-
-- TBD

.story_kit/work/1_backlog/310_story_bot_delete_command_removes_a_story_from_the_pipeline.md

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----
-name: "Bot delete command removes a story from the pipeline"
----
-
-# Story 310: Bot delete command removes a story from the pipeline
-
-## User Story
-
-As a project owner in a Matrix room, I want to type "{bot_name} delete {story_number}" to remove a story/bug/spike from the pipeline, so that I can clean up obsolete or duplicate work items from chat.
-
-## Acceptance Criteria
-
-- [ ] '{bot_name} delete {number}' finds the story/bug/spike by number across all pipeline stages and deletes the file
-- [ ] Confirms deletion with the story name and stage it was in
-- [ ] Returns a friendly message if no story with that number exists
-- [ ] Stops any running agent on the story before deleting
-- [ ] Removes the worktree if one exists for the story
-- [ ] Registered in the command registry so it appears in help output
-- [ ] Handled at bot level without LLM invocation
-- [ ] Commits the deletion to git
-
-## Out of Scope
-
-- TBD

.story_kit/work/1_backlog/312_bug_auto_assign_assigns_mergemaster_to_coding_stage_stories.md

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+---
+name: "Auto-assign assigns mergemaster to coding-stage stories"
+---
+
+# Bug 312: Auto-assign assigns mergemaster to coding-stage stories
+
+## Description
+
+Auto-assign picked mergemaster for story 310 which was in 2_current/. Mergemaster should only work on stories in 4_merge/. The auto_assign_available_work function doesn't enforce that the agent's configured stage matches the pipeline stage of the story it's being assigned to. Story 279 (auto-assign respects agent stage from front matter) was supposed to fix stage matching, but the check may only apply to front-matter preferences, not the fallback assignment path. This was observed on 2026-03-19 when story 310 was moved back to backlog and restarted — mergemaster was assigned instead of a coder.
+
+## How to Reproduce
+
+1. Move a story to 2_current/ with no agent front matter preference
+2. Wait for auto_assign_available_work to run
+3. Observe that mergemaster gets assigned instead of a coder agent
+
+## Actual Result
+
+Mergemaster was assigned to story 310 in 2_current/.
+
+## Expected Result
+
+Only coder-stage agents should be assigned to stories in 2_current/. Mergemaster should only be assigned to stories in 4_merge/.
+
+## Acceptance Criteria
+
+- [ ] auto_assign_available_work checks that the agent's configured stage matches the pipeline stage of the story before assigning
+- [ ] Coder agents only assigned to stories in 2_current/
+- [ ] QA agents only assigned to stories in 3_qa/
+- [ ] Mergemaster only assigned to stories in 4_merge/
+- [ ] Fallback assignment path respects stage matching (not just front-matter preference path)