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-memory/src/lib.rs

@@ -0,0 +1,109 @@
+//! Memory system for cross-session knowledge persistence.
+//!
+//! This crate provides a markdown-based memory storage layer that allows
+//! Grok to persist important information across sessions. Memory files are
+//! stored under `~/.kigi/memory/` with workspace-scoped subdirectories
+//! keyed by a blake3 hash of the workspace path.
+//!
+//! ## Data Layout
+//!
+//! ```text
+//! ~/.kigi/memory/
+//!   ├── MEMORY.md                         # Global curated knowledge
+//!   └── {workspace_hash}/                 # Per-workspace (blake3(cwd)[..16])
+//!       ├── MEMORY.md                     # Project-level curated knowledge
+//!       └── sessions/
+//!           └── YYYY-MM-DD-{slug}-{sid8}.md  # Session logs
+//! ```
+//!
+//! ## Feature Flag
+//!
+//! Memory is gated behind `--experimental-memory` CLI flag or
+//! `KIGI_MEMORY=1` environment variable. When disabled, this crate
+//! is not initialized by the host.
+
+pub mod archive;
+pub mod backend;
+pub mod chunker;
+pub mod dream;
+pub mod dream_lock;
+pub mod embedding;
+pub mod index;
+pub mod mmr;
+pub mod query_expansion;
+pub mod schema;
+pub mod search;
+pub mod storage;
+pub mod text_utils;
+pub mod watcher;
+
+pub use backend::{MemoryBackendImpl, MemoryBackendParams};
+pub use index::{MemoryIndex, init_sqlite_vec};
+pub use storage::{MemoryScope, MemoryStorage};
+
+/// Embed all chunks that don't have embeddings yet.
+///
+/// Queries the index for unembedded chunks, batches them through the
+/// embedding provider, and upserts the results. Logs progress.
+///
+/// This is the async glue between the sync `MemoryIndex` and the async
+/// `EmbeddingProvider`. Call after reindex, flush writes, or session-end writes.
+pub async fn embed_missing_chunks(
+    index: &MemoryIndex,
+    provider: &dyn embedding::EmbeddingProvider,
+) -> usize {
+    let chunks = match index.chunks_without_embeddings() {
+        Ok(c) if c.is_empty() => return 0,
+        Ok(c) => c,
+        Err(e) => {
+            tracing::warn!(
+                target: kigi_log::memory_log::TARGET,
+                error = %e,
+                "failed to query chunks without embeddings"
+            );
+            return 0;
+        }
+    };
+
+    let total = chunks.len();
+    let mut embedded = 0;
+
+    // Batch in groups of 32 (provider's typical max batch size)
+    for batch in chunks.chunks(32) {
+        let texts: Vec<&str> = batch.iter().map(|(_, text)| text.as_str()).collect();
+        match provider.embed_batch(&texts).await {
+            Ok(embeddings) => {
+                for ((chunk_id, _), embedding) in batch.iter().zip(embeddings.iter()) {
+                    if let Err(e) = index.upsert_embedding(chunk_id, embedding) {
+                        tracing::warn!(
+                            target: kigi_log::memory_log::TARGET,
+                            chunk_id,
+                            error = %e,
+                            "failed to upsert embedding"
+                        );
+                    } else {
+                        embedded += 1;
+                    }
+                }
+            }
+            Err(e) => {
+                tracing::warn!(
+                    target: kigi_log::memory_log::TARGET,
+                    error = %e,
+                    batch_size = texts.len(),
+                    "embedding batch failed, skipping"
+                );
+            }
+        }
+    }
+
+    if embedded > 0 {
+        tracing::info!(
+            target: kigi_log::memory_log::TARGET,
+            embedded,
+            total,
+            "embedded missing chunks"
+        );
+    }
+    embedded
+}