feat(cli): Add search, stats, embed, sync, health, and robot-docs commands

Extends the CLI with six new commands that complete the search pipeline:

- lore search <QUERY>: Hybrid search with mode selection (lexical,
  hybrid, semantic), rich filtering (--type, --author, --project,
  --label, --path, --after, --updated-after), result limits, and
  optional explain mode showing RRF score breakdowns. Safe FTS mode
  sanitizes user input; raw mode passes through for power users.

- lore stats: Document and index statistics with optional --check
  for integrity verification and --repair to fix inconsistencies
  (orphaned documents, missing FTS entries, stale dirty queue items).

- lore embed: Generate vector embeddings via Ollama. Supports
  --retry-failed to re-attempt previously failed embeddings.

- lore generate-docs: Drain the dirty queue to regenerate documents.
  --full seeds all entities for complete rebuild. --project scopes
  to a single project.

- lore sync: Full pipeline orchestration (ingest issues + MRs,
  generate-docs, embed) with --no-embed and --no-docs flags for
  partial runs. Reports per-stage results and total elapsed time.

- lore health: Quick pre-flight check (config exists, DB exists,
  schema current). Returns exit code 1 if unhealthy. Designed for
  agent pre-flight scripts.

- lore robot-docs: Machine-readable command manifest for agent
  self-discovery. Returns all commands, flags, examples, exit codes,
  and recommended workflows as structured JSON.

Also enhances lore init with --gitlab-url, --token-env-var, and
--projects flags for fully non-interactive robot-mode initialization.
Fixes init's force/non-interactive precedence logic and adds JSON
output for robot mode.

Updates all command files for the GiError -> LoreError rename.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/cli/commands/auth_test.rs

@@ -1,7 +1,7 @@
 //! Auth test command - verify GitLab authentication.
 
 use crate::core::config::Config;
-use crate::core::error::{GiError, Result};
+use crate::core::error::{LoreError, Result};
 use crate::gitlab::GitLabClient;
 
 /// Result of successful auth test.
@@ -19,12 +19,12 @@ pub async fn run_auth_test(config_path: Option<&str>) -> Result<AuthTestResult>
     // 2. Get token from environment
     let token = std::env::var(&config.gitlab.token_env_var)
         .map(|t| t.trim().to_string())
-        .map_err(|_| GiError::TokenNotSet {
+        .map_err(|_| LoreError::TokenNotSet {
             env_var: config.gitlab.token_env_var.clone(),
         })?;
 
     if token.is_empty() {
-        return Err(GiError::TokenNotSet {
+        return Err(LoreError::TokenNotSet {
             env_var: config.gitlab.token_env_var.clone(),
         });
     }