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).

README.md

@@ -0,0 +1,52 @@
+# Kigi
+
+**Kigi** (`kigi`) is an unofficial Kimi Code CLI community build — a
+terminal-based AI coding agent based on the Apache-2.0 sources of
+[xai-org/grok-build](https://github.com/xai-org/grok-build), re-targeted at
+the Kimi Code subscription API and the Moonshot open platform.
+
+It runs as a full-screen TUI that understands your codebase, edits files,
+executes shell commands, and manages long-running tasks — interactively,
+headlessly for scripting/CI, or embedded in editors via the Agent Client
+Protocol (ACP).
+
+Kigi is not affiliated with Moonshot AI or xAI. It coexists with the official
+`kimi` CLI on the same machine: independent binary name, independent config
+directory (`~/.kigi`), independent keyring credentials, and a `KIGI_*`
+environment-variable namespace. Nothing the official client installs or
+stores is touched.
+
+## Status
+
+`0.1.0` — milestone M0 (compilable skeleton) complete:
+
+- 62 workspace crates renamed to the `kigi-*` namespace; brand and env-var
+  namespaces separated from upstream.
+- Telemetry, voice input, announcements, plugin marketplace, and
+  relay/gateway remote services removed. Kigi is **zero-telemetry**: the
+  only outbound connections are the inference/auth APIs you configure,
+  GitHub Releases for updates, and MCP servers you add.
+- Toolchain Rust 1.97.0; `cargo check`/`clippy --workspace --all-targets`
+  clean; `cargo deny check advisories` gate in place.
+
+Authentication and inference against Kimi Code (milestone M1), the
+compatibility surface (M2), and release distribution (M3) are in progress.
+
+## Building from source
+
+```sh
+rustup toolchain install 1.97.0
+cargo build --profile release-dist -p kigi-bin
+./target/release-dist/kigi --version
+```
+
+`protoc` is invoked through the vendored [dotslash](https://dotslash-cli.com)
+launcher at `bin/protoc`; install dotslash (`brew install dotslash` or
+`cargo install dotslash`) if it is not already on your PATH.
+
+## License
+
+Apache-2.0. See [LICENSE](LICENSE), [NOTICE](NOTICE), and
+[THIRD-PARTY-NOTICES](THIRD-PARTY-NOTICES). Code ported from
+openai/codex and sst/opencode is documented in
+[crates/codegen/kigi-tools/THIRD_PARTY_NOTICES.md](crates/codegen/kigi-tools/THIRD_PARTY_NOTICES.md).