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_global_extra_headers_e2e.rs

@@ -0,0 +1,83 @@
+//! End-to-end test for the global `[models]` defaults.
+//!
+//! Runs the built grok binary against the mock inference server with a
+//! caller-owned `$KIGI_SHARE_DIR` whose `config.toml` sets every global `[models]`
+//! default. Asserts the turn succeeds with all of them set and that the
+//! wire-observable one — `extra_headers` — reaches the `/v1/chat/completions`
+//! request header, for a model with no per-model `[model.<id>]` override.
+//!
+//! The scalar defaults (temperature, top_p, max_completion_tokens, max_retries,
+//! inference_idle_timeout_secs, stream_tool_calls) are exercised here to prove
+//! they parse and the turn still completes; their resolution onto the model is
+//! covered directly by `config.rs` unit tests. The headless turn does not
+//! surface sampling params in the chat-completions body, so they are not
+//! wire-asserted here.
+//!
+//! `#[ignore]` (needs a built binary). Run locally (auto-builds the pager):
+//! ```bash
+//! cargo test -p kigi-shell --test test_global_extra_headers_e2e -- --ignored
+//! ```
+
+use kigi_test_support::*;
+
+/// Every global `[models]` default is accepted, and the wire-observable
+/// `extra_headers` reaches the inference request with no per-model block in play.
+#[tokio::test]
+#[ignore] // requires pre-built binary; run with --ignored
+async fn global_models_config_reaches_inference_request() {
+    let server = MockInferenceServer::start()
+        .await
+        .expect("start mock server");
+    let workdir = git_workdir();
+    let home = tempfile::TempDir::new().unwrap();
+
+    let kigi_home = home.path().join(".kigi");
+    std::fs::create_dir_all(&kigi_home).expect("create .kigi home");
+    std::fs::write(
+        kigi_home.join("config.toml"),
+        r#"[models]
+extra_headers = { "X-Request-Tags" = "team=example,env=prod" }
+temperature = 0.5
+top_p = 0.25
+max_completion_tokens = 4096
+max_retries = 7
+inference_idle_timeout_secs = 600
+stream_tool_calls = true
+"#,
+    )
+    .expect("write config.toml");
+
+    let mut cmd = tokio::process::Command::new(grok_binary());
+    cmd.args(["-p", "say hi", "--yolo", "--output-format", "json"])
+        .arg("--cwd")
+        .arg(workdir.path())
+        .current_dir(workdir.path())
+        .stdin(std::process::Stdio::null())
+        .stdout(std::process::Stdio::piped())
+        .stderr(std::process::Stdio::piped())
+        .kill_on_drop(true);
+    kigi_test_support::env::test_env_cmd_tokio(&mut cmd, &server.url(), home.path());
+    cmd.env("KIGI_SHARE_DIR", kigi_home);
+    // Don't attach to a developer's ambient leader; spawn fresh against the mock.
+    cmd.env_remove("KIGI_LEADER_SOCKET");
+
+    let result = run_headless_with_cmd(cmd).await;
+    assert_headless_success(&result, "global models config e2e", Some(&server));
+
+    let requests = server.requests();
+    let chat = requests
+        .iter()
+        .find(|e| e.method == "POST" && e.path.contains("chat/completions"))
+        .unwrap_or_else(|| {
+            panic!(
+                "no POST /v1/chat/completions request logged; requests:\n{}",
+                server.request_log_summary()
+            )
+        });
+    assert_eq!(
+        chat.header("x-request-tags"),
+        Some("team=example,env=prod"),
+        "global [models].extra_headers must reach the request header; requests:\n{}",
+        server.request_log_summary()
+    );
+}