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-tools/schema/tool_meta.schema.json

@@ -0,0 +1,55 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "CanonicalToolMeta",
+  "description": "The canonical tool-identity envelope, attached to a tool-call event `_meta`\nas one nested object under [`TOOL_META_KEY`].\n\n```json\n\"x.ai/tool\": {\n  \"version\": 1,\n  \"name\": \"read_file\",\n  \"kind\": \"read\",\n  \"namespace\": \"grok_build\",\n  \"label\": \"Read\",\n  \"read_only\": true,\n  \"input\": { \"path\": \"...\" }\n}\n```\n\nConsumer contract:\n- **`label`** is the cross-harness grouping/display key: equivalent tools\n  share it (grok `read_file` → `\"Read\"`).\n- **`kind`** is a finer discriminator (`metadata.kind()`), *not* guaranteed\n  equal for equivalent ops across harnesses (listing is `list` in one\n  toolset, `list_dir` in another); prefer `label` to join, tolerate unknowns.\n- **`name`** is the harness-specific model-facing name; for diagnostics.\n  For harness-initiated events (e.g. the `bash_mode` marker), `raw_input`\n  is not guaranteed to match `name`'s schema.\n- **`input`** is a canonical *projection*, not a mirror: cross-harness keys\n  only, so some raw fields are intentionally dropped (e.g. grep flags,\n  `replace_all`), and bulky payload\n  fields (edit `old_string`/`new_string`, full write contents) are never\n  projected — read them from `raw_input`. It is omitted entirely\n  when no stable shape exists (MCP / dynamic / out-of-scope). When a field or\n  the whole dict is absent, fall back to `raw_input` on this or an earlier\n  update for the same `tool_call_id` (some updates, e.g. a parse failure,\n  carry neither and rely on the merge below).\n- **Lifecycle:** updates for one call share a `tool_call_id` — merge across\n  them (last write wins); `input` may arrive on a later update.\n- **Versioning:** additive changes (new object fields, new `kind` / `label`\n  values) don't bump `version`. Unknown `kind` degrades to `\"other\"`;\n  `namespace` is a closed enum (no `other` sink), so a new toolset fails\n  strict typed deserialization of the whole envelope — intentional, to force\n  typed consumers with exhaustive matches to update. Out-of-tree consumers\n  should read `namespace` loosely (as a string) and, on any `x.ai/tool`\n  parse failure, treat it as absent and fall back to `raw_input` + the ACP\n  `kind`. `version` bumps only on removal or meaning change.",
+  "type": "object",
+  "properties": {
+    "version": {
+      "type": "integer",
+      "format": "uint32",
+      "minimum": 0
+    },
+    "name": {
+      "type": "string"
+    },
+    "kind": {
+      "$ref": "#/definitions/ToolKind"
+    },
+    "namespace": {
+      "$ref": "#/definitions/ToolNamespace"
+    },
+    "label": {
+      "type": "string"
+    },
+    "read_only": {
+      "type": "boolean"
+    },
+    "input": true
+  },
+  "required": [
+    "version",
+    "name",
+    "kind",
+    "namespace",
+    "label",
+    "read_only"
+  ],
+  "definitions": {
+    "ToolKind": {
+      "description": "Categorizes what a tool does at a high level. Open set — consumers must tolerate unknown values (Rust deserializes them to `other` via `#[serde(other)]`). Known values: `read`, `edit`, `delete`, `list_dir`, `write`, `move`, `search`, `lsp`, `execute`, `plan`, `web_search`, `web_fetch`, `background_task_action`, `wait_tasks_action`, `kill_task_action`, `list`, `skill`, `memory_search`, `memory_get`, `task`, `enter_plan`, `exit_plan`, `ask_user`, `image_gen`, `video_gen`, `image_to_video`, `reference_to_video`, `deploy_app`, `search_tool`, `use_tool`, `monitor`, `goal_update`, `other`.",
+      "type": "string"
+    },
+    "ToolNamespace": {
+      "description": "The toolset a tool belongs to.\n\nSerializes to snake_case (`grok_build`, `mcp`, …) for the\ncanonical tool `_meta` wire contract. PascalCase aliases are accepted on\ndeserialize so legacy persisted/manifest values still parse. The\n`Display` impl remains PascalCase for existing qualified id strings\n(e.g. `\"GrokBuild:read_file\"`); only the serde form goes on the wire.",
+      "type": "string",
+      "enum": [
+        "grok_build",
+        "grok_build_concise",
+        "grok_build_hashline",
+        "codex",
+        "opencode",
+        "mcp"
+      ]
+    }
+  }
+}