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/schema.rs

@@ -0,0 +1,98 @@
+//! SQL schema constants for the memory index.
+//!
+//! The index uses three tables:
+//! - `meta` — key-value metadata (embedding dimensions, schema version)
+//! - `chunks` — indexed text chunks with blake3 content hashes
+//! - `chunks_fts` — contentless FTS5 virtual table for BM25 keyword search
+//!
+//! When sqlite-vec is available, a fourth table is created:
+//! - `chunks_vec` — vec0 virtual table for KNN vector search
+
+/// Schema version. Bump when making breaking schema changes that require
+/// dropping and recreating tables.
+pub const SCHEMA_VERSION: u32 = 1;
+
+/// Generate the SQL schema for the memory index.
+///
+/// `dimensions` controls the embedding vector size for `chunks_vec`.
+/// If `vec_available` is false, the `chunks_vec` table is not created.
+///
+/// Connection pragmas (busy_timeout, journal_mode) are applied on the open
+/// path (`kigi_sqlite_journal::JournalMode::open`) — the journal mode depends
+/// on the database's filesystem.
+pub fn schema_sql(dimensions: usize, vec_available: bool) -> String {
+    let mut sql = format!(
+        r#"
+CREATE TABLE IF NOT EXISTS meta (
+    key TEXT PRIMARY KEY,
+    value TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS chunks (
+    rowid INTEGER PRIMARY KEY AUTOINCREMENT,
+    id TEXT UNIQUE NOT NULL,
+    path TEXT NOT NULL,
+    start_line INTEGER NOT NULL,
+    end_line INTEGER NOT NULL,
+    text TEXT NOT NULL,
+    hash TEXT NOT NULL,
+    source TEXT NOT NULL,
+    created_at INTEGER NOT NULL,
+    updated_at INTEGER NOT NULL,
+    access_count INTEGER DEFAULT 0,
+    last_accessed INTEGER
+);
+
+CREATE INDEX IF NOT EXISTS idx_chunks_path ON chunks(path);
+CREATE INDEX IF NOT EXISTS idx_chunks_hash ON chunks(hash);
+
+CREATE VIRTUAL TABLE IF NOT EXISTS chunks_fts USING fts5(text, content='');
+
+INSERT OR IGNORE INTO meta(key, value) VALUES ('reindex_claim', '');
+"#
+    );
+
+    if vec_available {
+        sql.push_str(&format!(
+            "\nCREATE VIRTUAL TABLE IF NOT EXISTS chunks_vec USING vec0(\n    \
+             chunk_id TEXT PRIMARY KEY,\n    \
+             embedding FLOAT[{dimensions}]\n);\n"
+        ));
+    }
+
+    sql
+}
+
+/// SQL to insert or update an embedding dimension record in the meta table.
+pub const UPSERT_META_SQL: &str = "INSERT OR REPLACE INTO meta(key, value) VALUES (?1, ?2)";
+
+/// SQL to query a meta value by key.
+pub const GET_META_SQL: &str = "SELECT value FROM meta WHERE key = ?1";
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_schema_sql_without_vec() {
+        let sql = schema_sql(1536, false);
+        assert!(sql.contains("CREATE TABLE IF NOT EXISTS chunks"));
+        assert!(sql.contains("CREATE VIRTUAL TABLE IF NOT EXISTS chunks_fts"));
+        assert!(!sql.contains("chunks_vec"));
+        // Connection pragmas live on the open path, not in the schema batch.
+        assert!(!sql.contains("PRAGMA"));
+    }
+
+    #[test]
+    fn test_schema_sql_with_vec() {
+        let sql = schema_sql(384, true);
+        assert!(sql.contains("chunks_vec"));
+        assert!(sql.contains("FLOAT[384]"));
+    }
+
+    #[test]
+    fn test_schema_sql_different_dimensions() {
+        let sql = schema_sql(768, true);
+        assert!(sql.contains("FLOAT[768]"));
+    }
+}