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/cli/commands/doctor.rs

@@ -1,5 +1,3 @@
-//! Doctor command - check environment health.
-
 use console::style;
 use serde::Serialize;
 
@@ -100,30 +98,22 @@ pub struct LoggingCheck {
     pub total_bytes: Option<u64>,
 }
 
-/// Run the doctor command.
 pub async fn run_doctor(config_path: Option<&str>) -> DoctorResult {
     let config_path_buf = get_config_path(config_path);
     let config_path_str = config_path_buf.display().to_string();
 
-    // Check config
     let (config_check, config) = check_config(&config_path_str);
 
-    // Check database
     let database_check = check_database(config.as_ref());
 
-    // Check GitLab
     let gitlab_check = check_gitlab(config.as_ref()).await;
 
-    // Check projects
     let projects_check = check_projects(config.as_ref());
 
-    // Check Ollama
     let ollama_check = check_ollama(config.as_ref()).await;
 
-    // Check logging
     let logging_check = check_logging(config.as_ref());
 
-    // Success if all required checks pass (ollama and logging are optional)
     let success = config_check.result.status == CheckStatus::Ok
         && database_check.result.status == CheckStatus::Ok
         && gitlab_check.result.status == CheckStatus::Ok
@@ -393,7 +383,6 @@ async fn check_ollama(config: Option<&Config>) -> OllamaCheck {
     let base_url = &config.embedding.base_url;
     let model = &config.embedding.model;
 
-    // Short timeout for Ollama check
     let client = reqwest::Client::builder()
         .timeout(std::time::Duration::from_secs(2))
         .build()
@@ -418,9 +407,6 @@ async fn check_ollama(config: Option<&Config>) -> OllamaCheck {
                         .map(|m| m.name.split(':').next().unwrap_or(&m.name))
                         .collect();
 
-                    // Strip tag from configured model name too (e.g.
-                    // "nomic-embed-text:v1.5" → "nomic-embed-text") so both
-                    // sides are compared at the same granularity.
                     let model_base = model.split(':').next().unwrap_or(model);
                     if !model_names.contains(&model_base) {
                         return OllamaCheck {
@@ -531,7 +517,6 @@ fn check_logging(config: Option<&Config>) -> LoggingCheck {
     }
 }
 
-/// Format and print doctor results to console.
 pub fn print_doctor_results(result: &DoctorResult) {
     println!("\nlore doctor\n");