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-shell/tests/fixtures/synthetic_clean_completion.json

@@ -0,0 +1,25 @@
+{
+  "name": "clean_completion",
+  "description": "Assistant ended its turn with no outstanding todos. The gate must NOT fire — this is the only true 'happy path' for end-of-turn.",
+  "turns": [
+    {
+      "turn_index": 0,
+      "kind": "user",
+      "content": "<synthetic user prompt — content scrubbed>"
+    },
+    {
+      "turn_index": 1,
+      "kind": "assistant",
+      "tool_calls_emitted": [],
+      "todo_state_after_turn": [
+        {
+          "id": "ship-it",
+          "status": "completed",
+          "content": "land the PR"
+        }
+      ],
+      "backing_task_count": 0,
+      "expected_gate_decision": "continue"
+    }
+  ]
+}

crates/codegen/kigi-shell/tests/fixtures/synthetic_pr_babysit_partial_backing.json

@@ -0,0 +1,41 @@
+{
+  "name": "pr_babysit_partial_backing",
+  "description": "Three /pr-babysit todos are in_progress but only one polling subagent is alive — the gate's tightened heuristic (PR2 partition) must classify the two unbacked items and fire with the in-flight reason. Backed items are intentionally NOT listed in the reminder body (the gate already decided not to nudge on them); negative coverage lives in the inline turn_end_guard_tests in acp_session.rs.",
+  "turns": [
+    {
+      "turn_index": 0,
+      "kind": "user",
+      "content": "<synthetic user prompt — content scrubbed>"
+    },
+    {
+      "turn_index": 1,
+      "kind": "assistant",
+      "tool_calls_emitted": [],
+      "todo_state_after_turn": [
+        {
+          "id": "pr-1",
+          "status": "in_progress",
+          "content": "pr-1:ci-green"
+        },
+        {
+          "id": "pr-2",
+          "status": "in_progress",
+          "content": "pr-2:ci-green"
+        },
+        {
+          "id": "pr-3",
+          "status": "in_progress",
+          "content": "pr-3:ci-green"
+        }
+      ],
+      "backing_task_count": 1,
+      "expected_gate_decision": "nudge",
+      "expected_reason": "in_flight",
+      "expected_reminder_contains": [
+        "In-progress (no backing background task)",
+        "pr-2:ci-green",
+        "pr-3:ci-green"
+      ]
+    }
+  ]
+}

crates/codegen/kigi-shell/tests/fixtures/synthetic_stranded_narration.json

@@ -0,0 +1,31 @@
+{
+  "name": "stranded_narration",
+  "description": "Assistant ended its turn with a content-only message while a pending todo remains and no backing background task exists. Canonical PR1 §B 'stranded narration' failure shape: the gate must fire with the in-flight reason.",
+  "turns": [
+    {
+      "turn_index": 0,
+      "kind": "user",
+      "content": "<synthetic user prompt — content scrubbed>"
+    },
+    {
+      "turn_index": 1,
+      "kind": "assistant",
+      "tool_calls_emitted": [],
+      "todo_state_after_turn": [
+        {
+          "id": "fix-round-1",
+          "status": "pending",
+          "content": "fix open review issues"
+        }
+      ],
+      "backing_task_count": 0,
+      "expected_gate_decision": "nudge",
+      "expected_reason": "in_flight",
+      "expected_reminder_contains": [
+        "ended your turn",
+        "Pending:",
+        "fix open review issues"
+      ]
+    }
+  ]
+}