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-render/src/syntax.rs

@@ -0,0 +1,79 @@
+//! Syntax highlighting initialization.
+//!
+//! Provides lazily-initialized `Syntect` instances for code highlighting.
+//! Dark themes (GrokNight, TokyoNight) share `grok-night.tmTheme`;
+//! GrokDay uses `grok-day.tmTheme` with deepened colors for light backgrounds.
+
+use std::sync::OnceLock;
+
+pub use kigi_markdown::Syntect;
+
+use crate::theme::ThemeKind;
+
+static SYNTECT_GROKNIGHT: OnceLock<Syntect> = OnceLock::new();
+static SYNTECT_TOKYONIGHT: OnceLock<Syntect> = OnceLock::new();
+static SYNTECT_GROKDAY: OnceLock<Syntect> = OnceLock::new();
+
+/// Convert syntect style to ratatui foreground-only style, quantized for terminal color support.
+pub fn syntect_to_ratatui_fg(style: syntect::highlighting::Style) -> ratatui::style::Style {
+    let fg = crate::theme::quantize(ratatui::style::Color::Rgb(
+        style.foreground.r,
+        style.foreground.g,
+        style.foreground.b,
+    ));
+    let mut out = ratatui::style::Style::default().fg(fg);
+    use syntect::highlighting::FontStyle;
+    if style.font_style.contains(FontStyle::BOLD) {
+        out = out.add_modifier(ratatui::style::Modifier::BOLD);
+    }
+    if style.font_style.contains(FontStyle::ITALIC) {
+        out = out.add_modifier(ratatui::style::Modifier::ITALIC);
+    }
+    if style.font_style.contains(FontStyle::UNDERLINE) {
+        out = out.add_modifier(ratatui::style::Modifier::UNDERLINED);
+    }
+    out
+}
+
+/// Highlight a single line of source, falling back to plain text style.
+pub fn highlight_line(
+    text: &str,
+    highlighter: &mut Option<syntect::easy::HighlightLines<'_>>,
+    syntect: &Syntect,
+    fallback: ratatui::style::Style,
+) -> Vec<ratatui::text::Span<'static>> {
+    if let Some(hl) = highlighter.as_mut()
+        && let Ok(ranges) = hl.highlight_line(&format!("{text}\n"), &syntect.syntax_set)
+    {
+        let mut spans = Vec::new();
+        for (style, segment) in ranges {
+            let mut s = segment.to_owned();
+            while s.ends_with('\n') || s.ends_with('\r') {
+                s.pop();
+            }
+            if s.is_empty() {
+                continue;
+            }
+            spans.push(ratatui::text::Span::styled(s, syntect_to_ratatui_fg(style)));
+        }
+        if !spans.is_empty() {
+            return spans;
+        }
+    }
+    vec![ratatui::text::Span::styled(text.to_string(), fallback)]
+}
+
+/// Returns the syntect instance matching the active theme.
+pub fn get_syntect() -> &'static Syntect {
+    match crate::theme::Theme::current_kind() {
+        ThemeKind::GrokNight
+        | ThemeKind::RosePineMoon
+        | ThemeKind::OscuraMidnight
+        | ThemeKind::Auto => SYNTECT_GROKNIGHT
+            .get_or_init(|| Syntect::new(include_bytes!("../assets/grok-night.tmTheme"))),
+        ThemeKind::TokyoNight => SYNTECT_TOKYONIGHT
+            .get_or_init(|| Syntect::new(include_bytes!("../assets/tokyo-night.tmTheme"))),
+        ThemeKind::GrokDay => SYNTECT_GROKDAY
+            .get_or_init(|| Syntect::new(include_bytes!("../assets/grok-day.tmTheme"))),
+    }
+}