feat(respond): conversational replies on review-comment threads

README.md

@@ -998,6 +998,47 @@ Live text output includes run ID, gate status, decision, outcome, PR, artifacts,
 and post counts. JSON output includes `run`, `status`, `decision`, `message`,
 `outbox`, `artifacts`, and `fail_on_triggered`.
 
+### `cr respond`
+
+```text
+cr respond <PR> [flags]
+```
+
+Responds to human replies on `cr`'s own open review-comment threads, closing the
+conversational loop on a finding without forcing a full re-review. The PR host
+must match the active profile's `git.host`.
+
+`cr respond` lists the pull request's inline review threads and selects the ones
+that meet all of:
+
+- the first comment is a `cr` finding (it matches the posting identity and
+  carries a codereview marker),
+- the thread is still open (unresolved), and
+- the latest comment is a human reply that `cr` has not already answered.
+
+For each selected thread, a small-tier LLM classifier reads the original finding
+plus the full thread and chooses one of `acknowledge_and_resolve` (post a brief
+acknowledgement and resolve the thread because the finding is addressed or
+conceded), `reply_only` (post a contextual answer and keep the thread open), or
+`skip` (take no action). Threads with no new human reply never reach the
+classifier, so repeated runs are idempotent without persisted per-thread state.
+
+| Flag | Semantics |
+|------|-----------|
+| `--dry-run` | Plan thread replies and print the plan without posting. |
+| `--no-post` | Alias for `--dry-run`. |
+| `--no-resolve-threads` | Post replies but never resolve threads. Also implied by profile `resolve_threads: never`. |
+| `--json` | Emit JSON. |
+
+Text output includes the PR, mode, considered/replied/resolved/skipped counts,
+and a per-thread breakdown. JSON output includes `pr_url`, `dry_run`, the same
+counts, and a `threads` array with each thread's `decision`, `reply`, and
+`resolved` state.
+
+The classifier uses the profile's `small` model tier (falling back to `medium`
+when `small` is unset, with a warning); a profile with neither configured is
+rejected.
+
 ### `cr benchmark`
 
 ```text

cmd/cr/main.go

@@ -18,6 +18,7 @@ import (
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/datacmd"
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/exitcode"
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/mecmd"
+	"github.com/open-cli-collective/codereview-cli/internal/cmd/respondcmd"
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/reviewcmd"
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/root"
 	"github.com/open-cli-collective/codereview-cli/internal/cmd/sessionscmd"
@@ -47,6 +48,6 @@ func buildRootCommand(stdin io.Reader, stdout, stderr io.Writer) (*cobra.Command
 		Stdout: stdout,
 		Stderr: stderr,
 	})
-	root.RegisterAll(cmd, opts, configcmd.Register, credentialcmd.Register, mecmd.Register, agentscmd.Register, reviewcmd.Register, sessionscmd.Register, datacmd.Register, benchmarkcmd.Register)
+	root.RegisterAll(cmd, opts, configcmd.Register, credentialcmd.Register, mecmd.Register, agentscmd.Register, reviewcmd.Register, respondcmd.Register, sessionscmd.Register, datacmd.Register, benchmarkcmd.Register)
 	return cmd, opts
 }

cmd/cr/main_test.go

@@ -34,6 +34,7 @@ func TestRun(t *testing.T) {
 		{name: "me command wired", args: []string{"me", "--help"}, wantCode: 0, wantStdout: "Resolve and cache", wantStdoutSubstring: true},
 		{name: "agents command wired", args: []string{"agents", "--help"}, wantCode: 0, wantStdout: "Inspect trusted review agents", wantStdoutSubstring: true},
 		{name: "review command wired", args: []string{"review", "--help"}, wantCode: 0, wantStdout: "Run an automated pull-request review", wantStdoutSubstring: true},
+		{name: "respond command wired", args: []string{"respond", "--help"}, wantCode: 0, wantStdout: "Respond to human replies", wantStdoutSubstring: true},
 		{name: "sessions command wired", args: []string{"sessions", "--help"}, wantCode: 0, wantStdout: "Manage named LLM sessions", wantStdoutSubstring: true},
 		{name: "data command wired", args: []string{"data", "--help"}, wantCode: 0, wantStdout: "Manage local review data", wantStdoutSubstring: true},
 		{name: "benchmark command wired", args: []string{"benchmark", "--help"}, wantCode: 0, wantStdout: "Validate, inspect, and run benchmark suites", wantStdoutSubstring: true},