feat(cli): implement 'lore file-history' command (bd-z94)

Adds file-history command showing which MRs touched a file, with:
- Rename chain resolution via BFS (resolve_rename_chain from bd-1yx)
- DiffNote discussion snippets with --discussions flag
- --merged filter, --no-follow-renames, -n limit
- Human output with styled MR list and rename chain display
- Robot JSON output with {ok, data, meta} envelope
- Autocorrect registry and robot-docs manifest entry
- Fixes pre-existing --no-status missing from sync autocorrect registry

src/cli/mod.rs

@@ -234,6 +234,10 @@ pub enum Commands {
     /// People intelligence: experts, workload, active discussions, overlap
     Who(WhoArgs),
 
+    /// Show MRs that touched a file, with linked discussions
+    #[command(name = "file-history")]
+    FileHistory(FileHistoryArgs),
+
     /// Detect discussion divergence from original intent
     Drift {
         /// Entity type (currently only "issues" supported)
@@ -966,6 +970,42 @@ pub struct WhoArgs {
     pub all_history: bool,
 }
 
+#[derive(Parser)]
+#[command(after_help = "\x1b[1mExamples:\x1b[0m
+  lore file-history src/main.rs                  # MRs that touched this file
+  lore file-history src/auth/ -p group/repo      # Scoped to project
+  lore file-history src/foo.rs --discussions      # Include DiffNote snippets
+  lore file-history src/bar.rs --no-follow-renames  # Skip rename chain")]
+pub struct FileHistoryArgs {
+    /// File path to trace history for
+    pub path: String,
+
+    /// Scope to a specific project (fuzzy match)
+    #[arg(short = 'p', long, help_heading = "Filters")]
+    pub project: Option<String>,
+
+    /// Include discussion snippets from DiffNotes on this file
+    #[arg(long, help_heading = "Output")]
+    pub discussions: bool,
+
+    /// Disable rename chain resolution
+    #[arg(long = "no-follow-renames", help_heading = "Filters")]
+    pub no_follow_renames: bool,
+
+    /// Only show merged MRs
+    #[arg(long, help_heading = "Filters")]
+    pub merged: bool,
+
+    /// Maximum results
+    #[arg(
+        short = 'n',
+        long = "limit",
+        default_value = "50",
+        help_heading = "Output"
+    )]
+    pub limit: usize,
+}
+
 #[derive(Parser)]
 pub struct CountArgs {
     /// Entity type to count (issues, mrs, discussions, notes, events)