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/render/highlight.rs

@@ -0,0 +1,77 @@
+//! Match-highlight overlay shared by the list pane and other search surfaces.
+
+use ratatui::buffer::Buffer;
+use ratatui::layout::Rect;
+
+use crate::render::wrapping::{
+    byte_offset_to_display_col, byte_range_to_row_cols, wrap_byte_ranges_matching,
+};
+
+/// Invert (REVERSED) the buffer cells covering every match of `re` in `text`.
+///
+/// Run as a post-pass after a line has been drawn, so matches are highlighted
+/// regardless of the underlying colors.
+///
+/// - `area`: the pane area; `area.x` / `area.width` bound painting horizontally.
+/// - `row_y`: buffer row of the line's first visible row.
+/// - `viewport_bottom`: exclusive bottom row; wrapped rows at or below it stop.
+/// - `skip`: leading wrapped rows of this line clipped above the viewport.
+/// - `prefix_w`: display column where `text` begins (e.g. a line-number gutter).
+/// - `text`: the plain text the regex runs against.
+/// - `single_row`: the line occupies one buffer row (NoWrap, or any 1-row item).
+#[allow(clippy::too_many_arguments)]
+pub fn paint_match_highlights(
+    buf: &mut Buffer,
+    area: Rect,
+    row_y: u16,
+    viewport_bottom: u16,
+    skip: u16,
+    prefix_w: u16,
+    text: &str,
+    re: &regex::Regex,
+    single_row: bool,
+) {
+    if text.is_empty() {
+        return;
+    }
+
+    if single_row {
+        for m in re.find_iter(text) {
+            let col_start = prefix_w as usize + byte_offset_to_display_col(text, m.start());
+            let col_end = prefix_w as usize + byte_offset_to_display_col(text, m.end());
+            for col in col_start..col_end {
+                let x = area.x + col as u16;
+                if x < area.x + area.width {
+                    invert_cell(&mut buf[(x, row_y)]);
+                }
+            }
+        }
+        return;
+    }
+
+    let text_w = area.width.saturating_sub(prefix_w) as usize;
+    let ranges = wrap_byte_ranges_matching(text, text_w);
+    for m in re.find_iter(text) {
+        for seg in byte_range_to_row_cols(text, &ranges, m.start()..m.end()) {
+            if seg.row < skip as usize {
+                continue;
+            }
+            let y = row_y + (seg.row - skip as usize) as u16;
+            if y >= viewport_bottom {
+                break;
+            }
+            for col in seg.col_start..seg.col_end {
+                let x = area.x + prefix_w + col as u16;
+                if x < area.x + area.width {
+                    invert_cell(&mut buf[(x, y)]);
+                }
+            }
+        }
+    }
+}
+
+/// Apply the terminal's REVERSED attribute so the fg/bg swap is native and
+/// respects the user's theme.
+fn invert_cell(cell: &mut ratatui::buffer::Cell) {
+    cell.modifier.insert(ratatui::style::Modifier::REVERSED);
+}