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-pager-pty-harness/src/env.rs

@@ -0,0 +1,94 @@
+//! Environment helpers for benchmarking and testing.
+
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+
+use anyhow::{Context, Result, bail};
+
+fn workspace_root() -> Result<PathBuf> {
+    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .ancestors()
+        .nth(3)
+        .map(|p| p.to_path_buf())
+        .context("failed to resolve workspace root from CARGO_MANIFEST_DIR")
+}
+
+fn target_dir() -> Result<PathBuf> {
+    Ok(std::env::var_os("CARGO_TARGET_DIR")
+        .map(PathBuf::from)
+        .unwrap_or_else(|| {
+            workspace_root()
+                .expect("workspace root for target_dir fallback")
+                .join("target")
+        }))
+}
+
+fn local_pager_binary_path() -> Result<PathBuf> {
+    Ok(target_dir()?
+        .join("debug")
+        .join(format!("kigi-tui{}", std::env::consts::EXE_SUFFIX)))
+}
+
+fn ensure_local_pager_binary(binary: &std::path::Path) -> Result<()> {
+    if binary.exists() {
+        return Ok(());
+    }
+
+    let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".to_owned());
+    let mut cmd = Command::new(&cargo);
+    cmd.current_dir(workspace_root()?)
+        .args(["build", "-p", "kigi-bin", "--bin", "kigi-tui"])
+        .stdin(Stdio::null())
+        .envs(kigi_tty_utils::pager_env());
+    kigi_tty_utils::detach_std_command(&mut cmd);
+    let output = cmd
+        .output()
+        .with_context(|| format!("failed to spawn {cargo} to build kigi-tui"))?;
+
+    if !output.status.success() {
+        bail!(
+            "failed to build kigi-tui (exit {:?})\nstdout:\n{}\nstderr:\n{}",
+            output.status.code(),
+            String::from_utf8_lossy(&output.stdout),
+            String::from_utf8_lossy(&output.stderr),
+        );
+    }
+    if !binary.exists() {
+        bail!(
+            "kigi-tui build completed but binary missing at {}",
+            binary.display()
+        );
+    }
+    Ok(())
+}
+
+/// Resolve the pager binary path.
+///
+/// Resolution order:
+/// 1. `PAGER_BINARY` env var (for CI / explicit override)
+/// 2. `CARGO_BIN_EXE_kigi-tui` (set by `cargo test`)
+/// 3. Build locally via `cargo build -p kigi-bin` (the composition-
+///    root package that owns the `kigi-tui` binary)
+pub fn pager_binary() -> Result<PathBuf> {
+    if let Ok(path) = std::env::var("PAGER_BINARY") {
+        let p = PathBuf::from(path);
+        if !p.exists() {
+            bail!("PAGER_BINARY does not exist: {}", p.display());
+        }
+        // Bazel sets PAGER_BINARY to a runfiles-relative path; portable_pty
+        // resolves non-absolute paths via PATH lookup instead of the cwd.
+        return std::path::absolute(&p)
+            .with_context(|| format!("failed to absolutize PAGER_BINARY: {}", p.display()));
+    }
+
+    if let Ok(path) = std::env::var("CARGO_BIN_EXE_kigi-tui") {
+        let p = PathBuf::from(path);
+        if p.exists() {
+            return Ok(p);
+        }
+    }
+
+    let binary = local_pager_binary_path()?;
+    ensure_local_pager_binary(&binary)?;
+    Ok(binary)
+}