feat(cli): add centralized render module with semantic Theme and LoreRenderer

Introduce src/cli/render.rs as the single source of truth for all terminal
output styling and formatting utilities. Key components:

- LoreRenderer: global singleton initialized once at startup, resolving
  color mode (Auto/Always/Never) against TTY state and NO_COLOR env var.
  This fixes lipgloss's limitation of hardcoded TrueColor rendering by
  gating all style application through a colors_on() check.

- Theme: semantic style constants (success/warning/error/info/accent,
  entity refs, state colors, structural styles) that return plain
  Style::new() when colors are disabled. Replaces ad-hoc console::style()
  calls scattered across 15+ command modules.

- Shared formatting utilities consolidated from duplicated implementations:
  format_relative_time (was in list.rs and who.rs), format_number (was in
  count.rs and sync_status.rs), truncate (was truncate_with_ellipsis in
  list.rs and truncate_summary in timeline.rs), format_labels, format_date,
  wrap_indent, section_divider.

- LoreTable: lightweight table renderer replacing comfy-table with simple
  column alignment (Left/Right/Center), adaptive terminal width, and
  NO_COLOR-safe output.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/mod.rs

@@ -1,6 +1,7 @@
 pub mod autocorrect;
 pub mod commands;
 pub mod progress;
+pub mod render;
 pub mod robot;
 
 use clap::{Parser, Subcommand};
@@ -810,7 +811,8 @@ pub struct EmbedArgs {
   lore timeline i:42                                  # Shorthand for issue:42
   lore timeline mr:99                                 # Direct: MR !99 and related entities
   lore timeline 'auth' --since 30d -p group/repo      # Scoped to project and time
-  lore timeline 'migration' --depth 2 --expand-mentions  # Deep cross-reference expansion")]
+  lore timeline 'migration' --depth 2              # Deep cross-reference expansion
+  lore timeline 'auth' --no-mentions               # Only 'closes' and 'related' edges")]
 pub struct TimelineArgs {
     /// Search text or entity reference (issue:N, i:N, mr:N, m:N)
     pub query: String,
@@ -827,9 +829,9 @@ pub struct TimelineArgs {
     #[arg(long, default_value = "1", help_heading = "Expansion")]
     pub depth: u32,
 
-    /// Also follow 'mentioned' edges during expansion (high fan-out)
-    #[arg(long = "expand-mentions", help_heading = "Expansion")]
-    pub expand_mentions: bool,
+    /// Skip 'mentioned' edges during expansion (only follow 'closes' and 'related')
+    #[arg(long = "no-mentions", help_heading = "Expansion")]
+    pub no_mentions: bool,
 
     /// Maximum number of events to display
     #[arg(