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-pager-pty-harness/Cargo.toml

@@ -0,0 +1,88 @@
+[package]
+name = "kigi-pager-pty-harness"
+version.workspace = true
+edition.workspace = true
+license = "Apache-2.0"
+authors = ["xAI"]
+description = "Shared PTY harness + scenario library for kigi-tui e2e tests and benchmarks."
+publish = false
+
+# Not imported into the production pager binary — the pager's Cargo.toml
+# only references this crate via [dev-dependencies], so `cargo build -p
+# kigi-tui` never compiles any of this.
+
+[dependencies]
+# Headless PTY controller with alacritty_terminal-based terminal emulation,
+# vim key notation parser, styled/HTML output, and HTTP server.
+dunce = { workspace = true }
+ptyctl = { path = "../ptyctl" }
+
+# PTY spawning + input/output
+portable-pty = { workspace = true }
+# Real OS signals (libc::kill) for the SIGINT/SIGTERM/SIGHUP e2e path.
+libc = { workspace = true }
+
+# alacritty_terminal re-exports `vte` which timing.rs uses for frame marker
+# detection. screen.rs uses ptyctl's Terminal (backed by alacritty_terminal)
+# instead of the old vt100 dependency.
+alacritty_terminal = { workspace = true }
+
+# Shared mock inference server used to drive content into the pager
+# during scenarios (content.rs wraps it).
+kigi-test-support = { workspace = true }
+
+# Async runtime + common helpers shared with the pager.
+tokio = { workspace = true, features = [
+    "sync",
+    "rt",
+    "macros",
+    "rt-multi-thread",
+    "io-util",
+    "io-std",
+    "time",
+    "net",
+] }
+
+anyhow = { workspace = true }
+base64 = { workspace = true }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }
+serde_yaml = { workspace = true }
+image = { workspace = true, features = ["png"] }
+tempfile = { workspace = true }
+kigi-tty-utils = { workspace = true }
+
+clap = { workspace = true, features = ["derive"] }
+
+[dev-dependencies]
+reqwest = { workspace = true }
+tracing-subscriber = { workspace = true }
+tracing = { workspace = true }
+
+[[bin]]
+name = "pty-scenario"
+path = "src/bin/pty_scenario.rs"
+
+# scroll-matrix — scroll validation matrix sweep. The curated tier also runs
+# in CI (tests/scroll_matrix_curated.rs); this binary is the local full-sweep
+# and single-cell-rerun entry point.
+[[bin]]
+name = "scroll-matrix"
+path = "src/bin/scroll_matrix.rs"
+
+# pty_bench scenario runner — produces a standalone binary the CI pipeline
+# pre-compiles and executes directly against a release pager artifact.
+# Lives here (not in the pager crate) so it can share the harness source
+# without any path hacks.
+[[bench]]
+name = "pty_bench"
+path = "benches/pty_bench.rs"
+harness = false
+
+# paste_latency — clipboard paste latency CLI (macOS-only at runtime: drives
+# the REAL host pasteboard). Standalone so `--binary` can target old pager
+# artifacts for before/after comparisons.
+[[bench]]
+name = "paste_latency"
+path = "benches/paste_latency.rs"
+harness = false