Implement herdr integration layer

internal/herdr/adapter.go

@@ -0,0 +1,62 @@
+package herdr
+
+import (
+	"context"
+	"fmt"
+	"time"
+)
+
+type Adapter interface {
+	Lease(context.Context, string, string) (Session, error)
+	Bootstrap(context.Context, Session, string) error
+	Release(context.Context, Session) (string, error)
+	Kill(context.Context, Session) error
+	Occupancy(Session) (float64, error)
+}
+type CLIAdapter struct {
+	Client  *Client
+	Harness string
+	Window  int64
+	Usage   func(string) (Usage, error)
+}
+
+func (a CLIAdapter) Lease(ctx context.Context, task, worktree string) (Session, error) {
+	if a.Client == nil {
+		return Session{}, fmt.Errorf("adapter: client required")
+	}
+	var s Session
+	e := a.Client.Call(ctx, "pane.create", map[string]string{"harness": a.Harness, "task_id": task, "worktree": worktree}, &s)
+	s.Harness = a.Harness
+	s.Worktree = worktree
+	return s, e
+}
+func (a CLIAdapter) Bootstrap(ctx context.Context, s Session, ref string) error {
+	return a.Client.Prompt(ctx, s.PaneID, fmt.Sprintf("Read handoff %s, validate the anchor and TASK.md, then continue.", ref), time.Minute)
+}
+func (a CLIAdapter) Release(ctx context.Context, s Session) (string, error) {
+	var r struct {
+		Ref string `json:"handoff_ref"`
+	}
+	e := a.Client.Call(ctx, "pane.release", s, &r)
+	return r.Ref, e
+}
+func (a CLIAdapter) Kill(ctx context.Context, s Session) error {
+	return a.Client.Call(ctx, "pane.kill", s, nil)
+}
+func (a CLIAdapter) Occupancy(s Session) (float64, error) {
+	if a.Usage == nil {
+		return 0, fmt.Errorf("adapter: usage reader required")
+	}
+	u, e := a.Usage(s.PaneID)
+	return Fraction(u, a.Window), e
+}
+
+var Claude = func(c *Client, w int64) CLIAdapter {
+	return CLIAdapter{Client: c, Harness: "claude", Window: w, Usage: ClaudeUsage}
+}
+var Codex = func(c *Client, w int64) CLIAdapter {
+	return CLIAdapter{Client: c, Harness: "codex", Window: w, Usage: CodexUsage}
+}
+var OpenCode = func(c *Client, w int64) CLIAdapter {
+	return CLIAdapter{Client: c, Harness: "opencode", Window: w, Usage: OpenCodeUsage}
+}