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-tui/src/scrollback/wrappers/mod.rs

@@ -0,0 +1,80 @@
+//! Wrapper types for composable rendering.
+//!
+//! These wrappers implement the `Renderable` trait and add decorations
+//! (accent lines, padding, etc.) around inner content.
+//!
+//! ## Composition Example
+//!
+//! ```text
+//! Padded::standard(                    // Adds left=2, right=1 padding
+//!     &Accented::with_fg(              // Adds accent line on left
+//!         &BlockRenderer::new(&block), // Renders block content
+//!         Color::Blue,
+//!     )
+//! )
+//! ```
+//!
+//! This produces:
+//! ```text
+//! │PP│A│ Content here... │P│
+//!  ↑↑  ↑                   ↑
+//!  │   └─ Accent           └─ Right padding
+//!  └───── Left padding
+//! ```
+
+mod accented;
+mod block_renderer;
+mod entry_renderer;
+mod padded;
+
+pub use accented::Accented;
+pub use block_renderer::BlockRenderer;
+pub use entry_renderer::EntryRenderer;
+pub(crate) use entry_renderer::group_header_chrome_prefix_width;
+pub use padded::Padded;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::render::Renderable;
+    use crate::scrollback::block::StubBlock;
+    use pretty_assertions::assert_eq;
+    use ratatui::buffer::Buffer;
+    use ratatui::layout::Rect;
+    use ratatui::style::Color;
+
+    /// Test that wrappers can be composed together.
+    #[test]
+    fn test_wrapper_composition() {
+        let block = StubBlock::new("Hello", Color::Blue);
+        let renderer = BlockRenderer::new(&block);
+        let accented = Accented::with_fg(&renderer, Color::Blue);
+        let padded = Padded::standard(&accented);
+
+        // Check height calculation chains correctly
+        // BlockRenderer: 3 (1 content + 2 vpad)
+        // Accented: takes 1 column, height unchanged
+        // Padded: takes 3 columns (2+1), height unchanged
+        assert_eq!(padded.desired_height(80), 3);
+
+        // Render and verify structure
+        let area = Rect::new(0, 0, 20, 3);
+        let mut buf = Buffer::empty(area);
+        padded.render(area, &mut buf);
+
+        // Layout should be:
+        // Cols 0-1: padding (empty)
+        // Col 2: accent line
+        // Cols 3+: content
+        // Last col: right padding
+
+        // Check accent is at column 2
+        assert_eq!(buf.cell((2, 0)).unwrap().symbol(), "┃");
+        assert_eq!(buf.cell((2, 1)).unwrap().symbol(), "┃");
+        assert_eq!(buf.cell((2, 2)).unwrap().symbol(), "┃");
+
+        // Check content starts at column 3 (after accent)
+        // Row 0 is vpad (empty), row 1 is content
+        assert_eq!(buf.cell((3, 1)).unwrap().symbol(), "H");
+    }
+}