feat: implement per-note search and document pipeline

- Add SourceType::Note with extract_note_document() and ParentMetadataCache
- Migration 022: composite indexes for notes queries + author_id column
- Migration 024: table rebuild adding 'note' to CHECK constraints, defense triggers
- Migration 025: backfill existing non-system notes into dirty queue
- Add lore notes CLI command with 17 filter options (author, path, resolution, etc.)
- Support table/json/jsonl/csv output formats with field selection
- Wire note dirty tracking through discussion and MR discussion ingestion
- Fix test_migration_024_preserves_existing_data off-by-one (tested wrong migration)
- Fix upsert_document_inner returning false for label/path-only changes

src/cli/mod.rs

@@ -112,6 +112,9 @@ pub enum Commands {
     /// List or show merge requests
     Mrs(MrsArgs),
 
+    /// List notes from discussions
+    Notes(NotesArgs),
+
     /// Ingest data from GitLab
     Ingest(IngestArgs),
 
@@ -489,6 +492,113 @@ pub struct MrsArgs {
     pub no_open: bool,
 }
 
+#[derive(Parser)]
+#[command(after_help = "\x1b[1mExamples:\x1b[0m
+  lore notes                                  # List 50 most recent notes
+  lore notes --author alice --since 7d        # Notes by alice in last 7 days
+  lore notes --for-issue 42 -p group/repo     # Notes on issue #42
+  lore notes --path src/ --resolution unresolved  # Unresolved diff notes in src/")]
+pub struct NotesArgs {
+    /// Maximum results
+    #[arg(
+        short = 'n',
+        long = "limit",
+        default_value = "50",
+        help_heading = "Output"
+    )]
+    pub limit: usize,
+
+    /// Select output fields (comma-separated, or 'minimal' preset: id,author_username,body,created_at_iso)
+    #[arg(long, help_heading = "Output", value_delimiter = ',')]
+    pub fields: Option<Vec<String>>,
+
+    /// Output format (table, json, jsonl, csv)
+    #[arg(
+        long,
+        default_value = "table",
+        value_parser = ["table", "json", "jsonl", "csv"],
+        help_heading = "Output"
+    )]
+    pub format: String,
+
+    /// Filter by author username
+    #[arg(short = 'a', long, help_heading = "Filters")]
+    pub author: Option<String>,
+
+    /// Filter by note type (DiffNote, DiscussionNote)
+    #[arg(long, help_heading = "Filters")]
+    pub note_type: Option<String>,
+
+    /// Filter by body text (substring match)
+    #[arg(long, help_heading = "Filters")]
+    pub contains: Option<String>,
+
+    /// Filter by internal note ID
+    #[arg(long, help_heading = "Filters")]
+    pub note_id: Option<i64>,
+
+    /// Filter by GitLab note ID
+    #[arg(long, help_heading = "Filters")]
+    pub gitlab_note_id: Option<i64>,
+
+    /// Filter by discussion ID
+    #[arg(long, help_heading = "Filters")]
+    pub discussion_id: Option<String>,
+
+    /// Include system notes (excluded by default)
+    #[arg(long, help_heading = "Filters")]
+    pub include_system: bool,
+
+    /// Filter to notes on a specific issue IID (requires --project or default_project)
+    #[arg(long, conflicts_with = "for_mr", help_heading = "Filters")]
+    pub for_issue: Option<i64>,
+
+    /// Filter to notes on a specific MR IID (requires --project or default_project)
+    #[arg(long, conflicts_with = "for_issue", help_heading = "Filters")]
+    pub for_mr: Option<i64>,
+
+    /// Filter by project path
+    #[arg(short = 'p', long, help_heading = "Filters")]
+    pub project: Option<String>,
+
+    /// Filter by time (7d, 2w, 1m, or YYYY-MM-DD)
+    #[arg(long, help_heading = "Filters")]
+    pub since: Option<String>,
+
+    /// Filter until date (YYYY-MM-DD, inclusive end-of-day)
+    #[arg(long, help_heading = "Filters")]
+    pub until: Option<String>,
+
+    /// Filter by file path (exact match or prefix with trailing /)
+    #[arg(long, help_heading = "Filters")]
+    pub path: Option<String>,
+
+    /// Filter by resolution status (any, unresolved, resolved)
+    #[arg(
+        long,
+        value_parser = ["any", "unresolved", "resolved"],
+        help_heading = "Filters"
+    )]
+    pub resolution: Option<String>,
+
+    /// Sort field (created, updated)
+    #[arg(
+        long,
+        value_parser = ["created", "updated"],
+        default_value = "created",
+        help_heading = "Sorting"
+    )]
+    pub sort: String,
+
+    /// Sort ascending (default: descending)
+    #[arg(long, help_heading = "Sorting")]
+    pub asc: bool,
+
+    /// Open first matching item in browser
+    #[arg(long, help_heading = "Actions")]
+    pub open: bool,
+}
+
 #[derive(Parser)]
 pub struct IngestArgs {
     /// Entity to ingest (issues, mrs). Omit to ingest everything
@@ -556,8 +666,8 @@ pub struct SearchArgs {
     #[arg(long, default_value = "hybrid", value_parser = ["lexical", "hybrid", "semantic"], help_heading = "Mode")]
     pub mode: String,
 
-    /// Filter by source type (issue, mr, discussion)
-    #[arg(long = "type", value_name = "TYPE", value_parser = ["issue", "mr", "discussion"], help_heading = "Filters")]
+    /// Filter by source type (issue, mr, discussion, note)
+    #[arg(long = "type", value_name = "TYPE", value_parser = ["issue", "mr", "discussion", "note"], help_heading = "Filters")]
     pub source_type: Option<String>,
 
     /// Filter by author username