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-markdown/bin/playground_common.rs

@@ -0,0 +1,84 @@
+#![allow(dead_code)]
+
+use kigi_markdown::{MarkdownStyle, Syntect};
+
+pub const fn rgb_color(r: u8, g: u8, b: u8) -> anstyle::Color {
+    anstyle::Color::Rgb(anstyle::RgbColor(r, g, b))
+}
+
+pub const fn fg(color: anstyle::Color) -> anstyle::Style {
+    anstyle::Style::new().fg_color(Some(color))
+}
+
+pub const fn bg(color: anstyle::Color) -> anstyle::Style {
+    anstyle::Style::new().bg_color(Some(color))
+}
+
+pub const TEAL: anstyle::Color = rgb_color(26, 188, 156);
+pub const BLUE: anstyle::Color = rgb_color(122, 162, 247);
+pub const ORANGE: anstyle::Color = rgb_color(255, 158, 100);
+pub const RED: anstyle::Color = rgb_color(247, 118, 142);
+pub const GREEN: anstyle::Color = rgb_color(158, 206, 106);
+pub const MAGENTA: anstyle::Color = rgb_color(187, 154, 247);
+pub const YELLOW: anstyle::Color = rgb_color(224, 175, 104);
+pub const CYAN: anstyle::Color = rgb_color(125, 207, 255);
+pub const COMMENT: anstyle::Color = rgb_color(86, 95, 137);
+pub const BG_DARK: anstyle::Color = rgb_color(31, 35, 53);
+
+pub const HEADING_COLORS: [anstyle::Color; 6] = [TEAL, BLUE, ORANGE, RED, GREEN, MAGENTA];
+
+pub const fn heading_styles(bold: bool, dimmed: bool, hidden: bool) -> [anstyle::Style; 6] {
+    let mut styles = [anstyle::Style::new(); 6];
+    let mut i = 0;
+    while i < HEADING_COLORS.len() {
+        styles[i] = fg(HEADING_COLORS[i]);
+        if bold {
+            styles[i] = styles[i].bold();
+        }
+        if dimmed {
+            styles[i] = styles[i].dimmed();
+        }
+        if hidden {
+            styles[i] = styles[i].hidden();
+        }
+        i += 1;
+    }
+    styles
+}
+
+pub const fn md_style(text: anstyle::Style) -> MarkdownStyle {
+    MarkdownStyle {
+        heading_inner: heading_styles(true, false, false),
+        heading_outer: heading_styles(false, true, true),
+        strong_inner: anstyle::Style::new().bold(),
+        strong_outer: anstyle::Style::new().dimmed().hidden(),
+        emphasis_inner: anstyle::Style::new().italic(),
+        emphasis_outer: anstyle::Style::new().dimmed().hidden(),
+        strikethrough_inner: anstyle::Style::new().strikethrough(),
+        strikethrough_outer: anstyle::Style::new().dimmed().hidden(),
+        inline_code_inner: fg(YELLOW).bold(),
+        inline_code_outer: fg(YELLOW).dimmed().hidden(),
+        blockquote_outer: fg(COMMENT).dimmed(),
+        task_checked: fg(CYAN),
+        task_unchecked: fg(BLUE).dimmed(),
+        list_item: fg(BLUE).dimmed(),
+        rule: fg(COMMENT),
+        link_outer: fg(COMMENT),
+        link_text: anstyle::Style::new().bold(),
+        link_url: fg(COMMENT),
+        link_title: fg(GREEN),
+        code_outer: fg(YELLOW).dimmed().hidden(),
+        code_language: fg(ORANGE).hidden(),
+        code_untagged: anstyle::Style::new(),
+        code_background: bg(BG_DARK),
+        table_outer: fg(BLUE).hidden(),
+        text,
+        math: anstyle::Style::new().italic(),
+    }
+}
+
+pub fn get_syntect() -> &'static Syntect {
+    use std::sync::OnceLock;
+    static SYNTECT: OnceLock<Syntect> = OnceLock::new();
+    SYNTECT.get_or_init(|| Syntect::new(include_bytes!("../assets/tokyo-night.tmTheme")))
+}