M0: compilable skeleton — Kigi 0.1.0 fork surgery

Hard fork of xai-org/grok-build (Apache-2.0) re-targeted as Kigi, an
unofficial Kimi Code CLI community build.

Rename & identity
- 72 xai-*/xai-grok-* crates -> kigi-* (explicit: xai-grok-pager-bin ->
  kigi-bin [binary `kigi`], xai-grok-pager -> kigi-tui; rest mechanical);
  ptyctl, ptyctl-cli, third_party/ unchanged; proto package
  xai.grok.tools.v1 -> kigi.tools.v1
- Config home ~/.kigi (KIGI_SHARE_DIR override), env prefix GROK_* ->
  KIGI_*, `kigi --version` carries the unofficial-community-build notice
- clap identity, help text, startup banner, prompt templates rebranded
  (templates re-encrypted)

Deletions (PRD removal list #5/#6/#7/#9/#10)
- voice input (xai-grok-voice) and all TUI wiring
- telemetry: Mixpanel client, external OTel stream, Sentry, OTLP layers,
  trace/GCS/S3 upload queues (kigi-file-utils halved), workspace upload
  module & dc_log, heap-profile uploader, auth-diagnostics uploader,
  session-analytics halves of feedback; local zero-egress observability
  preserved in new kigi-log crate (unified log, --debug firehose,
  subsystem file logs, opt-in instrumentation)
- announcements (crate, remote-settings fields, TUI surfaces)
- plugin marketplace (crate, sources/browse/CTA/extensions-modal tab);
  direct plugin install/uninstall/update via kigi-agent git_install kept
- relay/gateway/assets endpoints and features (agent relay, headless
  relay transport, gateway bridge, LeaderEnvUrls); leader IPC socket now
  ~/.kigi/leader.sock + KIGI_LEADER_SOCKET, no ws-url derivation
- functional types rehomed instead of deleted: PermissionMode ->
  kigi-config-types, McpInitStrategy -> kigi-mcp, PrCreationSource ->
  session signals, TerminalDiagnostics -> kigi-pager-render, agent_id ->
  shell util

Endpoints
- kigi-env rewritten: single production KigiEndpoints {coding_api_base_url
  https://api.kimi.com/coding/v1 (KIGI_CODE_BASE_URL), oauth_host
  https://auth.kimi.com (KIGI_OAUTH_HOST), update_base_url (GitHub
  Releases API), upgrade_page_url}; GrokBuildEnvironment enum deleted

Toolchain & workspace hygiene
- Rust 1.97.0 pinned; edition 2024; full cargo update; git2 hoisted to
  workspace at 0.21 (Option->Result API migration), quick-xml 0.41
- Root Cargo.toml hand-maintained (PRD §8.1): version 0.1.0 inherited by
  all members, members sorted, unused deps pruned
- cargo-deny advisories gate (deny.toml with documented transitive
  exceptions); CI workflow (check/clippy/fmt/deny/test, macOS+Linux)
- cross-crate test seams re-gated behind `test-support` cargo feature;
  insta snapshot baselines renamed to the kigi_tui prefix
- clippy --workspace --all-targets: zero warnings; fmt clean

Fixes surfaced by the port
- updater probe/installer divergence (bin/kigi vs bin/grok symlink set)
- idle model-metadata refresh dead under KIGI_CODE_BASE_URL override
  (new is_effective_coding_endpoint_url, loopback+override aware)
- macOS symlinked-TMPDIR fixture canonicalization (foreign_sessions,
  fast-worktree); RSS measurement tests serialized via serial_test

Docs & legal (Apache §4)
- NOTICE added (upstream attribution + change statement); THIRD-PARTY
  notices sustained; kigi-tools ported-code notices extended; README,
  CONTRIBUTING, SECURITY, AGENTS.md rewritten

Out of scope for M0 (tracked): Kimi auth/inference (M1), search/fetch,
command parity, config import (M2), Computer Hub excision & final
brand-token sweep (M2), distribution & self-update rewrite (M3).

crates/codegen/kigi-shell/tests/test_doomloop_capture.rs

@@ -0,0 +1,96 @@
+//! Mock-HTTP integration test for reasoning-only detection on the Responses
+//! API wire — the trigger that drives the model doomloop.
+//!
+//! Spawns a `MockInferenceServer` that serves a `/v1/responses` SSE stream
+//! carrying only reasoning (reasoning summary deltas, no output text, no tool
+//! call) and asserts the shell sampling client classifies the collected
+//! response as `EmptyReason::ReasoningOnly`. This is the exact check the
+//! sampler's retry loop runs on every completed turn to decide to resample
+//! (and accumulate the out-of-band streaming-capture segments verified by the
+//! actor-level capture test).
+
+mod common;
+
+use common::create_test_client;
+use kigi_sampling_types::EmptyReason;
+use kigi_shell::sampling::{ApiBackend, ConversationItem, ConversationRequest};
+use kigi_test_support::sse::responses_api_reasoning_only_events;
+use kigi_test_support::{MockInferenceServer, ScriptedResponse};
+
+/// A `/v1/responses` stream that streams only reasoning and finishes with no
+/// visible content must be collected into a response the client classifies as
+/// `EmptyReason::ReasoningOnly` — the detection that makes the shell resample
+/// and spin the doomloop. Exercises the real SSE/HTTP path
+/// (`conversation_collect` -> `stream_responses` -> `collect_response`).
+#[tokio::test]
+async fn responses_api_reasoning_only_is_classified_as_reasoning_only() {
+    let server = MockInferenceServer::start().await.unwrap();
+    server.enqueue_response(
+        "/v1/responses",
+        ScriptedResponse::sse(responses_api_reasoning_only_events(
+            "let me think carefully about this",
+            "grok-test",
+        )),
+    );
+    let client = create_test_client(&server.url(), ApiBackend::Responses);
+
+    let request = ConversationRequest::from_items(vec![ConversationItem::user(
+        "Solve this without writing anything",
+    )]);
+
+    // The stream completes normally — it is just empty — so collect succeeds.
+    let response = client
+        .conversation_collect(request)
+        .await
+        .expect("collect must succeed: the stream completes, the response is empty");
+
+    assert_eq!(
+        response.empty_reason(),
+        Some(EmptyReason::ReasoningOnly),
+        "a reasoning-only Responses stream must classify as reasoning_only",
+    );
+    assert!(response.is_empty());
+    // The reasoning sibling survived; the assistant is present but empty.
+    assert!(
+        response.reasoning_items().next().is_some(),
+        "the reasoning item must be collected as a sibling",
+    );
+    let assistant = response
+        .assistant()
+        .expect("an empty assistant is synthesized for the turn");
+    assert!(
+        assistant.content.is_empty(),
+        "reasoning-only means the assistant carried no visible content",
+    );
+}
+
+/// Negative control for the classifier: a normal text `/v1/responses` stream
+/// carrying visible assistant content must NOT be classified empty —
+/// `empty_reason()` is `None`, distinguishing real content from the
+/// reasoning-only case above. (No recovery/resample loop is exercised here.)
+#[tokio::test]
+async fn normal_text_response_is_not_classified_reasoning_only() {
+    let server = MockInferenceServer::start().await.unwrap();
+    server.set_response("The answer is 42.");
+    let client = create_test_client(&server.url(), ApiBackend::Responses);
+
+    let response = client
+        .conversation_collect(ConversationRequest::from_items(vec![
+            ConversationItem::user("What is the answer?"),
+        ]))
+        .await
+        .unwrap();
+
+    assert!(
+        response.empty_reason().is_none(),
+        "a normal text turn must not be classified empty",
+    );
+    let assistant = response
+        .assistant()
+        .expect("assistant present on a text turn");
+    assert!(
+        assistant.content.contains("42"),
+        "the text turn must carry the model's content, got: {:?}",
+        assistant.content,
+    );
+}