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/project.rs

@@ -2,14 +2,7 @@ use rusqlite::Connection;
 
 use super::error::{LoreError, Result};
 
-/// Resolve a project string to a project_id using cascading match:
-/// 1. Exact match on path_with_namespace
-/// 2. Case-insensitive exact match
-/// 3. Suffix match (e.g., "auth-service" matches "group/auth-service") — only if unambiguous
-/// 4. Substring match (e.g., "typescript" matches "vs/typescript-code") — only if unambiguous
-/// 5. Error with available projects list
 pub fn resolve_project(conn: &Connection, project_str: &str) -> Result<i64> {
-    // Step 1: Exact match
     let exact = conn.query_row(
         "SELECT id FROM projects WHERE path_with_namespace = ?1",
         rusqlite::params![project_str],
@@ -19,7 +12,6 @@ pub fn resolve_project(conn: &Connection, project_str: &str) -> Result<i64> {
         return Ok(id);
     }
 
-    // Step 2: Case-insensitive exact match
     let ci = conn.query_row(
         "SELECT id FROM projects WHERE LOWER(path_with_namespace) = LOWER(?1)",
         rusqlite::params![project_str],
@@ -29,7 +21,6 @@ pub fn resolve_project(conn: &Connection, project_str: &str) -> Result<i64> {
         return Ok(id);
     }
 
-    // Step 3: Suffix match (unambiguous)
     let mut suffix_stmt = conn.prepare(
         "SELECT id, path_with_namespace FROM projects
          WHERE path_with_namespace LIKE '%/' || ?1
@@ -59,7 +50,6 @@ pub fn resolve_project(conn: &Connection, project_str: &str) -> Result<i64> {
         _ => {}
     }
 
-    // Step 4: Case-insensitive substring match (unambiguous)
     let mut substr_stmt = conn.prepare(
         "SELECT id, path_with_namespace FROM projects
          WHERE LOWER(path_with_namespace) LIKE '%' || LOWER(?1) || '%'",
@@ -88,7 +78,6 @@ pub fn resolve_project(conn: &Connection, project_str: &str) -> Result<i64> {
         _ => {}
     }
 
-    // Step 5: No match — list available projects
     let mut all_stmt =
         conn.prepare("SELECT path_with_namespace FROM projects ORDER BY path_with_namespace")?;
     let all_projects: Vec<String> = all_stmt
@@ -211,7 +200,6 @@ mod tests {
         let conn = setup_db();
         insert_project(&conn, 1, "vs/python-code");
         insert_project(&conn, 2, "vs/typescript-code");
-        // "code" matches both projects
         let err = resolve_project(&conn, "code").unwrap_err();
         let msg = err.to_string();
         assert!(
@@ -225,11 +213,9 @@ mod tests {
 
     #[test]
     fn test_suffix_preferred_over_substring() {
-        // Suffix match (step 3) should resolve before substring (step 4)
         let conn = setup_db();
         insert_project(&conn, 1, "backend/auth-service");
         insert_project(&conn, 2, "backend/auth-service-v2");
-        // "auth-service" is an exact suffix of project 1
         let id = resolve_project(&conn, "auth-service").unwrap();
         assert_eq!(id, 1);
     }