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-chat-state/src/compaction_mode.rs

@@ -0,0 +1,149 @@
+//! Compaction mode — how much structure the model gets to recover detail the
+//! lossy summary dropped. In `kigi-chat-state` so flag resolution and the
+//! transcript-hint builder share one definition.
+
+use crate::compaction_transcript::CompactionDetail;
+
+/// How compaction exposes pre-compaction history to the model afterwards.
+/// `Segments` carries its verbatim detail level inline, since detail is
+/// meaningful only there.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, strum::Display)]
+#[strum(serialize_all = "snake_case")]
+pub enum CompactionMode {
+    /// Summary only — no pointer back to pre-compaction history. Default.
+    #[default]
+    Summary,
+    /// Summary + pointer to the full raw `updates.jsonl`.
+    Transcript,
+    /// Summary + a `compaction/` folder of clean per-segment markdown.
+    Segments(CompactionDetail),
+}
+
+impl CompactionMode {
+    /// Parse the mode word (case-insensitive); unknown → `None` so the caller
+    /// falls back. `segments` gets the default detail — callers override it via
+    /// [`CompactionMode::with_segment_detail`] once detail is resolved.
+    pub fn parse(s: &str) -> Option<Self> {
+        match s.trim().to_ascii_lowercase().as_str() {
+            "summary" => Some(Self::Summary),
+            "transcript" => Some(Self::Transcript),
+            "segments" => Some(Self::Segments(CompactionDetail::default())),
+            _ => None,
+        }
+    }
+
+    /// Replace the detail level if this is `Segments`, else unchanged. Lets the
+    /// resolver attach the separately-resolved `KIGI_COMPACTION_DETAIL`.
+    pub fn with_segment_detail(self, detail: CompactionDetail) -> Self {
+        match self {
+            Self::Segments(_) => Self::Segments(detail),
+            other => other,
+        }
+    }
+
+    pub fn segment_detail(self) -> Option<CompactionDetail> {
+        match self {
+            Self::Segments(d) => Some(d),
+            _ => None,
+        }
+    }
+
+    /// Whether this mode persists the `compaction/` segment store.
+    pub fn writes_segments(self) -> bool {
+        matches!(self, Self::Segments(_))
+    }
+
+    /// Transcript hint for the summary, given the one `location` this mode points
+    /// at (raw transcript path or `compaction/` folder). `None` if the mode adds
+    /// no pointer (`Summary`) or the location is absent.
+    pub fn transcript_hint(self, location: Option<&str>) -> Option<String> {
+        use crate::compaction_transcript::INDEX_FILE;
+        let loc = location?;
+        Some(match self {
+            Self::Summary => return None,
+            Self::Transcript => format!(
+                "\n\nIf you need specific details from before compaction \
+                 (like exact code snippets, error messages, or content you \
+                 generated), read the full transcript at: {loc}"
+            ),
+            // Wording mirrors the segment-store continuation note.
+            Self::Segments(_) => format!(
+                "\n\nFull verbatim rollouts of previous segments are available \
+                 at {loc}/segment_*.md.  See {loc}/{INDEX_FILE} for a table of \
+                 contents.  Use read_file or grep to recover specific details \
+                 (exact code, file paths, tool outputs) if this summary is \
+                 insufficient.  Do NOT modify these files."
+            ),
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// `parse` is the public string contract (config + CLI): case-insensitive,
+    /// unknown ⇒ `None` so the caller falls back.
+    #[test]
+    fn parse_maps_names_and_rejects_unknown() {
+        assert_eq!(
+            CompactionMode::parse("summary"),
+            Some(CompactionMode::Summary)
+        );
+        assert_eq!(
+            CompactionMode::parse("transcript"),
+            Some(CompactionMode::Transcript)
+        );
+        // `segments` parses with the default detail; the resolver overrides it.
+        assert_eq!(
+            CompactionMode::parse("  SEGMENTS "),
+            Some(CompactionMode::Segments(CompactionDetail::default()))
+        );
+        assert_eq!(CompactionMode::parse("nonsense"), None);
+        assert_eq!(CompactionMode::default(), CompactionMode::Summary);
+    }
+
+    /// Detail is only attached to `Segments`; other modes ignore the override.
+    #[test]
+    fn with_segment_detail_only_affects_segments() {
+        assert_eq!(
+            CompactionMode::Segments(CompactionDetail::Verbose)
+                .with_segment_detail(CompactionDetail::Minimal),
+            CompactionMode::Segments(CompactionDetail::Minimal)
+        );
+        assert_eq!(
+            CompactionMode::Summary.with_segment_detail(CompactionDetail::Minimal),
+            CompactionMode::Summary
+        );
+        assert_eq!(
+            CompactionMode::Segments(CompactionDetail::Balanced).segment_detail(),
+            Some(CompactionDetail::Balanced)
+        );
+        assert_eq!(CompactionMode::Transcript.segment_detail(), None);
+    }
+
+    /// Contract: no hint for `Summary`, and never point the model at nothing.
+    #[test]
+    fn transcript_hint_needs_a_location() {
+        let segments = CompactionMode::Segments(CompactionDetail::default());
+        assert!(
+            CompactionMode::Summary
+                .transcript_hint(Some("/s/updates.jsonl"))
+                .is_none()
+        );
+        assert!(CompactionMode::Transcript.transcript_hint(None).is_none());
+        assert!(segments.transcript_hint(None).is_none());
+        assert!(
+            CompactionMode::Transcript
+                .transcript_hint(Some("/s/updates.jsonl"))
+                .unwrap()
+                .contains("/s/updates.jsonl")
+        );
+        assert!(
+            segments
+                .transcript_hint(Some("/s/compaction"))
+                .unwrap()
+                .contains("/s/compaction")
+        );
+    }
+}