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/common/kigi-tool-protocol/src/registration.rs

@@ -0,0 +1,164 @@
+//! Registration payloads, descriptions, transports, and outcomes.
+
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    HookKind, IdError, NotificationSchemas, ServerId, SessionId, ToolCapabilities, ToolId, UserId,
+};
+
+/// Whether a registered tool runs in-process or behind a remote connection.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum TransportKind {
+    Local,
+    Remote,
+}
+
+/// A single tool's wire description plus optional schema and capability
+/// metadata. The `tool_id` is **not** stored explicitly — it is derived
+/// from `description.{namespace, name}` via [`Self::derive_tool_id`].
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ToolDescriptionWithSchema {
+    pub description: kigi_tool_types::ToolDescription,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub input_schema: Option<serde_json::Value>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub capabilities: Option<ToolCapabilities>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub notification_schemas: Option<NotificationSchemas>,
+}
+
+impl ToolDescriptionWithSchema {
+    /// Derive the canonical `ToolId`.
+    ///
+    /// Namespaced descriptions render as `"{namespace}:{name}"`; otherwise
+    /// the bare `name`. The result is run through [`ToolId::new`], so an
+    /// invalid name or namespace surfaces as an [`IdError`].
+    pub fn derive_tool_id(&self) -> Result<ToolId, IdError> {
+        match &self.description.namespace {
+            Some(ns) => ToolId::new(format!("{ns}:{}", self.description.name)),
+            None => ToolId::new(self.description.name.as_str()),
+        }
+    }
+}
+
+/// Single-tool registration. Wire-level sugar for a one-tool
+/// `register_server`.
+///
+/// `sessions` carries the per-tool session set with three-state
+/// semantics, modelled after `if_match_generation: Option<u64>`:
+///
+/// - `None` (field omitted on the wire) — "no change". For a
+///   first-time registration the computer hub treats this as the empty
+///   set; for a re-registration the existing session bindings are
+///   preserved untouched. Use this for heartbeat-style re-register
+///   flows that re-send the description without revisiting the
+///   session set.
+/// - `Some(vec![])` (explicit empty array) — "unbind every session".
+///   The tool stays registered against the connection but becomes
+///   unreachable from any session until [`crate::Method::BindToolSession`]
+///   adds a new binding.
+/// - `Some(vec![s1, ...])` — replace the per-tool session set with
+///   exactly the listed ids. Each id MUST already be in the
+///   connection's bound-session set (validated by the router);
+///   a missing id rejects the entire registration.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ToolRegistration {
+    /// MUST equal `description.derive_tool_id()`. Carried explicitly so
+    /// receivers can route without re-deriving. The IC service router
+    /// enforces this at register-tool time and rejects mismatches with
+    /// `InvalidRequest`.
+    pub tool_id: ToolId,
+    /// Per-tool session set. See struct doc-comment for the
+    /// `None` / `Some(vec![])` / `Some(vec![...])` semantics.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub sessions: Option<Vec<SessionId>>,
+    pub user_id: UserId,
+    /// `None` → computer hub synthesises `auto:tool:{tool_id}`.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub server_id: Option<ServerId>,
+    pub description: kigi_tool_types::ToolDescription,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub input_schema: Option<serde_json::Value>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub capabilities: Option<ToolCapabilities>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub notification_schemas: Option<NotificationSchemas>,
+    pub transport_kind: TransportKind,
+    /// Optimistic-concurrency precondition. `None` → last-writer-wins.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub if_match_generation: Option<u64>,
+    /// Opaque metadata supplied by the tool server at registration time.
+    /// Propagated to `ServerInfo.metadata` in `servers.list` responses.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub metadata: Option<serde_json::Value>,
+}
+
+impl ToolRegistration {
+    /// Derive the canonical `ToolId` from `description.{namespace, name}`.
+    /// The `tool_id` payload field MUST equal this value; the IC service
+    /// router enforces the invariant at register-tool time.
+    pub fn derive_tool_id(&self) -> Result<ToolId, IdError> {
+        match &self.description.namespace {
+            Some(ns) => ToolId::new(format!("{ns}:{}", self.description.name)),
+            None => ToolId::new(self.description.name.as_str()),
+        }
+    }
+}
+
+/// Multi-tool registration. The whole batch shares one `server_id` and one
+/// `sessions` value; per-tool outcomes are reported individually via
+/// [`RegistrationOutcome`].
+///
+/// `sessions` follows the same three-state semantics as
+/// [`ToolRegistration::sessions`]: `None` means "no change" (preserves
+/// existing per-tool session bindings on a re-register), `Some(vec![])`
+/// means "unbind every session for every tool in this batch", and
+/// `Some(vec![...])` means "replace each tool's session set with
+/// exactly these ids".
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ToolServerRegistration {
+    pub server_id: ServerId,
+    /// Per-batch session set. See struct doc-comment for `None` /
+    /// `Some(vec![])` / `Some(vec![...])` semantics.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub sessions: Option<Vec<SessionId>>,
+    pub user_id: UserId,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub title: Option<String>,
+    #[serde(default, skip_serializing_if = "String::is_empty")]
+    pub description: String,
+    pub tools: Vec<ToolDescriptionWithSchema>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub hooks: Vec<HookKind>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub if_match_generation: Option<u64>,
+    /// Opaque metadata supplied by the tool server at registration time.
+    /// Applied to every tool in the batch and propagated to
+    /// `ServerInfo.metadata` in `servers.list` responses.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub metadata: Option<serde_json::Value>,
+}
+
+/// Per-tool result from a `register_tool` or `register_server` call.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(tag = "outcome", rename_all = "snake_case")]
+pub enum RegistrationOutcome {
+    Registered {
+        tool_id: ToolId,
+        generation: u64,
+    },
+    Updated {
+        tool_id: ToolId,
+        generation: u64,
+    },
+    Shadowed {
+        tool_id: ToolId,
+        reason: String,
+    },
+    Rejected {
+        tool_id: ToolId,
+        code: String,
+        message: String,
+    },
+}