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/lib.rs

@@ -0,0 +1,73 @@
+//! xAI Computer Hub — wire-protocol types.
+//!
+//! Identifier newtypes, registration payloads, capabilities, hook events,
+//! handshake messages, the JSON-RPC 2.0 envelope and method catalog, the
+//! `ToolErrorWire` / `ToolOutputWire` / `WireToolNotification` wire enums,
+//! every method's `params` / `result` payload struct, and the numeric ↔
+//! string error-code mapping.
+
+#![forbid(unsafe_code)]
+
+mod capabilities;
+mod connection;
+pub mod envelope;
+pub mod error_codes;
+pub mod error_wire;
+pub mod frames;
+mod handshake;
+mod hook;
+mod ids;
+pub mod methods;
+pub mod notification_wire;
+pub mod output_wire;
+mod registration;
+mod registry_error;
+pub mod session_event;
+pub mod turn_hook;
+
+pub use capabilities::{HookKind, NotificationSchemas, StreamingSpec, ToolCapabilities, ToolScope};
+pub use connection::{ConnectionKind, ToolDefinitionMode};
+pub use envelope::{
+    JsonRpcError, JsonRpcId, JsonRpcNotification, JsonRpcRequest, JsonRpcResponse, JsonRpcVersion,
+    ResponseOutcome,
+};
+pub use error_codes::{
+    ERROR_CODES, WORKSPACE_UNAVAILABLE_JSONRPC_CODE, WORKSPACE_UNAVAILABLE_MESSAGE,
+    WORKSPACE_UNAVAILABLE_SUBCODE, WorkspaceGonePhase, WorkspaceGoneReason,
+    WorkspaceUnavailableDetails, workspace_unavailable_wire,
+};
+pub use error_wire::ToolErrorWire;
+pub use frames::{
+    AttachRoute, HookFrame, HookReplyFrame, LastSeq, LogsDonateParams, MAX_DONATION_BYTES,
+    MAX_LOG_RECORDS_PER_DONATION, MAX_METRICS_PER_DONATION, MAX_SPANS_PER_DONATION,
+    MAX_SYSTEM_NOTIFY_PAYLOAD_BYTES, MetricsDonateParams, NotificationFilter, PingFrame, PongFrame,
+    ServeParams, ServeResult, ServerBindAck, ServerBindOutcome, ServerBindParams, ServerInfo,
+    ServerUnbindAck, ServerUnbindOutcome, ServerUnbindParams, ServersListParams, ServersListResult,
+    SessionAttachServerParams, SessionAttachServerResult, SessionBindParams, SessionBindResult,
+    SessionBindServerParams, SessionBindServerResult, SessionCloseParams, SessionOpenParams,
+    SessionOpenResult, SessionUnbindParams, SessionUnbindServerParams, SubscribeAck,
+    SubscribeNotificationsParams, SubscribeOutcome, SystemNotifyParams, ToolCallParams,
+    ToolCallProgressFrame, ToolCallResult, ToolNotificationFrame, ToolSearchResult,
+    ToolServerConnectionStatus, ToolServerDisconnectReason, ToolServerEvictParams,
+    ToolServerGetStatusParams, ToolServerGetStatusResult, ToolServerLifecycleStatus,
+    ToolServerStatusPayload, ToolsChanged, ToolsListParams, ToolsListResult, ToolsSearchParams,
+    ToolsSearchResultBody, TracesDonateParams, UnsubscribeAck, UnsubscribeNotificationsParams,
+    UnsubscribeOutcome,
+};
+pub use handshake::{HelloAckMsg, HelloMsg, PROTOCOL_VERSION};
+pub use hook::HookEvent;
+pub use ids::{
+    ConnectionId, FrameSeq, IdError, RequestId, ServerId, SessionId, ToolCallId, ToolId, UserId,
+};
+pub use methods::{Method, UNKNOWN_METHOD_MSG_PREFIX};
+pub use notification_wire::{
+    KNOWN_NOTIFICATION_KINDS, KnownVariantCollision, WireCustomNotification, WireToolNotification,
+    check_custom_kind, known_notification_kinds,
+};
+pub use output_wire::{McpBlock, ToolOutputWire};
+pub use registration::{
+    RegistrationOutcome, ToolDescriptionWithSchema, ToolRegistration, ToolServerRegistration,
+    TransportKind,
+};
+pub use registry_error::RegistryError;
+pub use session_event::{SessionEvent, SessionPhase, ToolCallOutcome};