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/app/dispatch/jump.rs

@@ -0,0 +1,83 @@
+//! `/jump` picker dispatchers: pure client-side turn navigation.
+
+use crate::app::actions::Effect;
+use crate::app::app_view::{ActiveView, AppView};
+use crate::scrollback::entry::EntryId;
+use crate::views::jump::{JumpRestore, JumpState};
+
+pub(super) fn dispatch_jump_show_picker(app: &mut AppView) -> Vec<Effect> {
+    let ActiveView::Agent(id) = app.active_view else {
+        return vec![];
+    };
+    let Some(agent) = app.agents.get_mut(&id) else {
+        return vec![];
+    };
+    // Refuse if another prompt overlay owns the input slot (rewind, inline-edit,
+    // /btw, or a pending permission/question/cancel-turn/plan overlay) — an
+    // opened picker would be hidden but still eat input.
+    if agent.jump_slot_taken() {
+        return vec![];
+    }
+
+    let entries = agent.scrollback.timeline_entries();
+    if entries.len() < 2 {
+        app.show_toast("Nothing to jump to yet");
+        return vec![];
+    }
+
+    let restore = JumpRestore {
+        bookmark: agent.scrollback.capture_scroll_bookmark(),
+        selected: agent.scrollback.selected(),
+        follow_mode: agent.scrollback.is_follow_mode(),
+    };
+    // Open on the turn currently at the viewport top (rows are oldest-first,
+    // so the row index is the turn index).
+    let selected = agent
+        .scrollback
+        .active_turn_for_viewport()
+        .unwrap_or(entries.len() - 1)
+        .min(entries.len() - 1);
+
+    let preview_id = entries[selected].prompt_entry_id;
+    agent.jump_state = Some(JumpState {
+        entries,
+        selected,
+        restore,
+    });
+    // Same top anchor that cursor moves preview and Enter lands on.
+    if let Some(idx) = agent.scrollback.index_of_id(preview_id) {
+        agent.scrollback.scroll_to_entry_top(idx);
+    }
+    vec![]
+}
+
+pub(super) fn dispatch_jump_picker_select(app: &mut AppView, prompt_id: EntryId) -> Vec<Effect> {
+    let ActiveView::Agent(id) = app.active_view else {
+        return vec![];
+    };
+    let Some(agent) = app.agents.get_mut(&id) else {
+        return vec![];
+    };
+    let Some(js) = agent.jump_state.take() else {
+        return vec![];
+    };
+    // The stable id resolves at the boundary; it fails only if the prompt was
+    // removed (async clear/rewind) while the picker was open. Restore the
+    // captured viewport so a failed jump never strands the transcript at the
+    // last preview scroll.
+    if !agent.scrollback.jump_to_entry(prompt_id) {
+        agent.restore_jump_viewport(js.restore);
+    }
+    vec![]
+}
+
+pub(super) fn dispatch_jump_dismiss(app: &mut AppView) -> Vec<Effect> {
+    let ActiveView::Agent(id) = app.active_view else {
+        return vec![];
+    };
+    let Some(agent) = app.agents.get_mut(&id) else {
+        return vec![];
+    };
+    agent.dismiss_jump_picker();
+    vec![]
+}