Inject relevant facts into coder agent context

When the coder agent starts work on a task, inject relevant facts from the knowledge base into its context alongside AGENTS.md.

Current State

Worker.hs line 272-275 builds fullPrompt:

let fullPrompt =
      prompt
        <> "\n\nREPOSITORY GUIDELINES (AGENTS.md):\n"
        <> agentsMd

Implementation

1. Query facts relevant to the task:

-- Get facts relevant to files the task might touch
getRelevantFacts :: TaskCore.Task -> IO [TaskCore.Fact]
getRelevantFacts task = do
  -- Get all facts
  allFacts <- Fact.getAllFacts
  
  -- Filter by namespace/project match
  let namespace = fromMaybe "Omni" (TaskCore.taskNamespace task)
      projectFacts = filter (\f -> TaskCore.factProject f == namespace) allFacts
  
  -- Sort by confidence, take top N
  let sorted = List.sortBy (comparing (Down . TaskCore.factConfidence)) projectFacts
  pure (take 10 sorted)  -- Limit to avoid context bloat

2. Format facts for inclusion:

formatFacts :: [TaskCore.Fact] -> Text
formatFacts [] = ""
formatFacts facts = Text.unlines
  [ "\n\nKNOWLEDGE BASE FACTS:"
  , "(These are learned patterns/conventions from previous work)"
  , ""
  ] <> Text.unlines (map formatFact facts)

formatFact :: TaskCore.Fact -> Text
formatFact f = 
  "- " <> TaskCore.factContent f 
  <> (if null (TaskCore.factRelatedFiles f) 
      then "" 
      else " [" <> Text.intercalate ", " (TaskCore.factRelatedFiles f) <> "]")

3. Update fullPrompt construction:

-- In runAmp, after reading agentsMd
relevantFacts <- getRelevantFacts task
let factsSection = formatFacts relevantFacts

let fullPrompt =
      prompt
        <> "\n\nREPOSITORY GUIDELINES (AGENTS.md):\n"
        <> agentsMd
        <> factsSection

4. Add imports for Omni.Fact and Data.List

Future Enhancements (not in scope)

• File-based relevance: match facts.related_files against files in task description
• Confidence decay: lower confidence for facts from rejected tasks
• Embedding-based retrieval for semantic matching

Files: Omni/Agent/Worker.hs

Testing: 1. Add a fact via CLI: jr facts add Omni "The build command is bild Omni/Jr.hs" 2. Run jr work <some-task> 3. Check _/llm/amp.log to verify facts appear in prompt