feat(worker): add Prime scheduler abstractions + runner

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Worker/Prime/PrimeRunner.cs

@@ -0,0 +1,53 @@
+using ClaudeDo.Data;
+using ClaudeDo.Worker.Runner;
+
+namespace ClaudeDo.Worker.Prime;
+
+public sealed class PrimeRunner : IPrimeRunner
+{
+    private static readonly TimeSpan FireTimeout = TimeSpan.FromSeconds(60);
+    private readonly IClaudeProcess _claude;
+    private readonly ILogger<PrimeRunner> _logger;
+
+    public PrimeRunner(IClaudeProcess claude, ILogger<PrimeRunner> logger)
+    {
+        _claude = claude;
+        _logger = logger;
+    }
+
+    public async Task<PrimeRunOutcome> FireAsync(PrimeScheduleDto schedule, CancellationToken ct)
+    {
+        var cwd = Paths.AppDataRoot();
+        Directory.CreateDirectory(cwd);
+
+        using var timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(ct);
+        timeoutCts.CancelAfter(FireTimeout);
+
+        try
+        {
+            var prompt = schedule.PromptOverride ?? "ping";
+            var result = await _claude.RunAsync(
+                arguments: "-p --max-turns 1",
+                prompt: prompt,
+                workingDirectory: cwd,
+                onStdoutLine: _ => Task.CompletedTask,
+                ct: timeoutCts.Token);
+
+            if (IsSuccess(result))
+                return new PrimeRunOutcome(true, "Primed Claude");
+            return new PrimeRunOutcome(false, FailureMessage(result));
+        }
+        catch (OperationCanceledException) when (timeoutCts.IsCancellationRequested && !ct.IsCancellationRequested)
+        {
+            return new PrimeRunOutcome(false, $"timed out after {FireTimeout.TotalSeconds:0}s");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Prime fire failed");
+            return new PrimeRunOutcome(false, ex.Message);
+        }
+    }
+
+    private static bool IsSuccess(RunResult result) => result.IsSuccess;
+    private static string FailureMessage(RunResult result) => $"exit code {result.ExitCode}";
+}