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/slash/commands/cd.rs

@@ -0,0 +1,122 @@
+//! `/cd [path]` — change the working directory new dashboard sessions
+//! spawn in.
+//!
+//! With no argument it opens the dashboard's location picker; with a path
+//! it changes directly. Both are dashboard affordances — invoked from a
+//! non-dashboard surface the dispatcher prints a toast pointing the user
+//! at `/dashboard` (see `dispatch_dashboard_open_location_picker` /
+//! `dispatch_dashboard_change_location`).
+
+use crate::app::actions::Action;
+use crate::slash::command::{CommandExecCtx, CommandResult, SlashCommand};
+
+/// Change the working directory for newly dispatched dashboard sessions.
+pub struct CdCommand;
+
+impl SlashCommand for CdCommand {
+    fn name(&self) -> &str {
+        "cd"
+    }
+
+    fn description(&self) -> &str {
+        "Change the working directory for new agents"
+    }
+
+    fn usage(&self) -> &str {
+        "/cd [path]"
+    }
+
+    fn takes_args(&self) -> bool {
+        true
+    }
+
+    fn arg_placeholder(&self) -> Option<&str> {
+        Some("path")
+    }
+
+    /// `/cd` only makes sense on the dashboard (it changes where the
+    /// dashboard dispatches new agents), so hide it from completion on
+    /// every other surface — the agent view and the welcome screen.
+    fn dashboard_only(&self) -> bool {
+        true
+    }
+
+    fn run(&self, _ctx: &mut CommandExecCtx, args: &str) -> CommandResult {
+        let trimmed = args.trim();
+        if trimmed.is_empty() {
+            CommandResult::Action(Action::DashboardOpenLocationPicker)
+        } else {
+            CommandResult::Action(Action::DashboardChangeLocation {
+                input: trimmed.to_string(),
+            })
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::acp::model_state::ModelState;
+    use crate::app::bundle::BundleState;
+
+    /// Build a throwaway exec ctx over the given borrows. Mirrors the
+    /// inline ctx construction in `dashboard.rs`'s command tests.
+    fn ctx<'a>(models: &'a ModelState, bundle: &'a BundleState) -> CommandExecCtx<'a> {
+        CommandExecCtx {
+            models,
+            session_id: None,
+            bundle_state: bundle,
+            screen_mode: crate::app::ScreenMode::Inline,
+            pager_state: crate::settings::PagerLocalSnapshot {
+                multiline_mode: false,
+                yolo_mode: false,
+                ..crate::settings::PagerLocalSnapshot::default()
+            },
+        }
+    }
+
+    #[test]
+    fn no_args_opens_location_picker() {
+        let (models, bundle) = (ModelState::default(), BundleState::default());
+        let mut c = ctx(&models, &bundle);
+        assert!(matches!(
+            CdCommand.run(&mut c, ""),
+            CommandResult::Action(Action::DashboardOpenLocationPicker)
+        ));
+    }
+
+    #[test]
+    fn whitespace_only_opens_location_picker() {
+        let (models, bundle) = (ModelState::default(), BundleState::default());
+        let mut c = ctx(&models, &bundle);
+        assert!(matches!(
+            CdCommand.run(&mut c, "   "),
+            CommandResult::Action(Action::DashboardOpenLocationPicker)
+        ));
+    }
+
+    #[test]
+    fn path_arg_changes_location() {
+        let (models, bundle) = (ModelState::default(), BundleState::default());
+        let mut c = ctx(&models, &bundle);
+        match CdCommand.run(&mut c, "  ~/projects/foo  ") {
+            CommandResult::Action(Action::DashboardChangeLocation { input }) => {
+                assert_eq!(input, "~/projects/foo");
+            }
+            other => panic!("expected DashboardChangeLocation, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn metadata() {
+        let cmd = CdCommand;
+        assert_eq!(cmd.name(), "cd");
+        assert!(cmd.takes_args());
+        assert_eq!(cmd.arg_placeholder(), Some("path"));
+        assert!(!cmd.description().is_empty());
+        assert!(!cmd.usage().is_empty());
+        // `/cd` is dashboard-only — hidden from completion on every other
+        // surface (the agent view, the welcome screen).
+        assert!(cmd.dashboard_only(), "/cd must be dashboard-only");
+    }
+}