refactor: Remove redundant doc comments throughout codebase

Removes module-level doc comments (//! lines) and excessive inline doc
comments that were duplicating information already evident from:
- Function/struct names (self-documenting code)
- Type signatures (the what is clear from types)
- Implementation context (the how is clear from code)

Affected modules:
- cli/* - Removed command descriptions duplicating clap help text
- core/* - Removed module headers and obvious function docs
- documents/* - Removed extractor/regenerator/truncation docs
- embedding/* - Removed pipeline and chunking docs
- gitlab/* - Removed client and transformer docs (kept type definitions)
- ingestion/* - Removed orchestrator and ingestion docs
- search/* - Removed FTS and vector search docs

Philosophy: Code should be self-documenting. Comments should explain
"why" (business decisions, non-obvious constraints) not "what" (which
the code itself shows). This change reduces noise and maintenance burden
while keeping the codebase just as understandable.

Retains comments for:
- Non-obvious business logic
- Important safety invariants
- Complex algorithm explanations
- Public API boundaries where generated docs matter

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

src/core/config.rs

@@ -1,7 +1,3 @@
-//! Configuration loading and validation.
-//!
-//! Config schema mirrors the TypeScript version with serde for deserialization.
-
 use serde::Deserialize;
 use std::fs;
 use std::path::Path;
@@ -9,7 +5,6 @@ use std::path::Path;
 use super::error::{LoreError, Result};
 use super::paths::get_config_path;
 
-/// GitLab connection settings.
 #[derive(Debug, Clone, Deserialize)]
 pub struct GitLabConfig {
     #[serde(rename = "baseUrl")]
@@ -23,13 +18,11 @@ fn default_token_env_var() -> String {
     "GITLAB_TOKEN".to_string()
 }
 
-/// Project to sync.
 #[derive(Debug, Clone, Deserialize)]
 pub struct ProjectConfig {
     pub path: String,
 }
 
-/// Sync behavior settings.
 #[derive(Debug, Clone, Deserialize)]
 #[serde(default)]
 pub struct SyncConfig {
@@ -77,7 +70,6 @@ impl Default for SyncConfig {
     }
 }
 
-/// Storage settings.
 #[derive(Debug, Clone, Deserialize, Default)]
 #[serde(default)]
 pub struct StorageConfig {
@@ -98,7 +90,6 @@ fn default_compress_raw_payloads() -> bool {
     true
 }
 
-/// Embedding provider settings.
 #[derive(Debug, Clone, Deserialize)]
 #[serde(default)]
 pub struct EmbeddingConfig {
@@ -120,19 +111,15 @@ impl Default for EmbeddingConfig {
     }
 }
 
-/// Logging and observability settings.
 #[derive(Debug, Clone, Deserialize)]
 #[serde(default)]
 pub struct LoggingConfig {
-    /// Directory for log files. Default: ~/.local/share/lore/logs/
     #[serde(rename = "logDir")]
     pub log_dir: Option<String>,
 
-    /// Days to retain log files. Default: 30. Set to 0 to disable file logging.
     #[serde(rename = "retentionDays", default = "default_retention_days")]
     pub retention_days: u32,
 
-    /// Enable JSON log files. Default: true.
     #[serde(rename = "fileLogging", default = "default_file_logging")]
     pub file_logging: bool,
 }
@@ -155,7 +142,6 @@ impl Default for LoggingConfig {
     }
 }
 
-/// Main configuration structure.
 #[derive(Debug, Clone, Deserialize)]
 pub struct Config {
     pub gitlab: GitLabConfig,
@@ -175,7 +161,6 @@ pub struct Config {
 }
 
 impl Config {
-    /// Load and validate configuration from file.
     pub fn load(cli_override: Option<&str>) -> Result<Self> {
         let config_path = get_config_path(cli_override);
 
@@ -188,7 +173,6 @@ impl Config {
         Self::load_from_path(&config_path)
     }
 
-    /// Load configuration from a specific path.
     pub fn load_from_path(path: &Path) -> Result<Self> {
         let content = fs::read_to_string(path).map_err(|e| LoreError::ConfigInvalid {
             details: format!("Failed to read config file: {e}"),
@@ -199,7 +183,6 @@ impl Config {
                 details: format!("Invalid JSON: {e}"),
             })?;
 
-        // Validate required fields
         if config.projects.is_empty() {
             return Err(LoreError::ConfigInvalid {
                 details: "At least one project is required".to_string(),
@@ -214,7 +197,6 @@ impl Config {
             }
         }
 
-        // Validate URL format
         if url::Url::parse(&config.gitlab.base_url).is_err() {
             return Err(LoreError::ConfigInvalid {
                 details: format!("Invalid GitLab URL: {}", config.gitlab.base_url),
@@ -225,7 +207,6 @@ impl Config {
     }
 }
 
-/// Minimal config for writing during init (relies on defaults when loaded).
 #[derive(Debug, serde::Serialize)]
 pub struct MinimalConfig {
     pub gitlab: MinimalGitLabConfig,