feat: update defaults, schema, and installer for new capabilities

Configuration and deployment updates to match the new feature set.

defaults.json:
  - Dark theme palette switched from named ANSI to Dracula-inspired hex:
    success=#50fa7b, warning=#f1fa8c, danger=#ff5555, accent=#8be9fd,
    info=#bd93f9. Light theme unchanged (named ANSI with bold).
  - Glyph characters normalized to Unicode escapes (clean/ahead/behind).
  - Verbose layout (3 lines) reorganized:
    Line 1: model, provider, spacer, lines_changed, project, vcs, beads
    Line 2: context_bar, context_usage, cache_efficiency, spacer, cost,
             cost_velocity, cost_trend, duration
    Line 3: context_trend, tokens_raw, spacer, tools, turns, load,
             cloud_profile, k8s_context, python_env, toolchain
  - context_usage, cost_trend, context_trend now enabled by default.
  - Trend widths increased from 8 to 12 characters.
  - Context bar: bar_style=block, gradient=true.
  - Tools: show_breakdown=true, top_n=7.
  - New sections enabled: cloud_profile (P2), k8s_context (P3, ttl=30),
    python_env (P3), toolchain (P3).

schema.json:
  - Added $schema self-reference field for editor autocomplete.
  - Expanded colorName from fixed enum to freeform string with docs
    covering hex, bg:, modifiers, and palette refs.
  - New section schemas: trendSection, contextTrendSection with width,
    gradient, and threshold properties.
  - context_bar: added bar_style, gradient, fill_char, empty_char.
  - tools: added show_breakdown, top_n, palette array.
  - All section types: added background and placeholder properties.
  - Width description updated to clarify it's a max cap + fallback,
    not an override.
  - colorMatch additionalProperties relaxed from enum to string.

install.sh:
  Complete rewrite for Rust binary workflow:
  - Checks cargo and jq prerequisites.
  - Builds release binary via cargo build --release.
  - Installs to ~/.local/bin/claude-statusline with PATH check.
  - Creates/updates ~/.claude/settings.json with statusLine command
    (type: "command", --color=always, padding: 0).
  - Symlinks statusline.json config if present in project.
  - Removed all bash-script-era logic (symlinks, bash version checks).

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

defaults.json

@@ -2,6 +2,7 @@
   "version": 1,
   "global": {
     "separator": " | ",
+    "separator_style": "text",
     "justify": "space-between",
     "vcs": "auto",
     "cache_dir": "/tmp/claude-sl-{session_id}-{cache_version}-{config_hash}",
@@ -14,14 +15,14 @@
   },
   "colors": {
     "dark": {
-      "success": "green",
-      "warning": "yellow",
-      "danger": "red",
-      "critical": "red bold",
+      "success": "#50fa7b",
+      "warning": "#f1fa8c",
+      "danger": "#ff5555",
+      "critical": "#ff5555 bold",
       "muted": "dim",
-      "accent": "cyan",
+      "accent": "#8be9fd",
       "highlight": "bold",
-      "info": "blue"
+      "info": "#bd93f9"
     },
     "light": {
       "success": "green bold",
@@ -41,9 +42,9 @@
       "separator_alt": "",
       "branch": "",
       "dirty": "*",
-      "clean": "✓",
-      "ahead": "↑",
-      "behind": "↓",
+      "clean": "\u2713",
+      "ahead": "\u2191",
+      "behind": "\u2193",
       "folder": "",
       "clock": "",
       "dollar": ""
@@ -93,24 +94,33 @@
       [
         "model",
         "provider",
+        "spacer",
+        "lines_changed",
         "project",
         "vcs",
         "beads"
       ],
       [
         "context_bar",
-        "tokens_raw",
+        "context_usage",
         "cache_efficiency",
+        "spacer",
         "cost",
-        "cost_velocity"
+        "cost_velocity",
+        "cost_trend",
+        "duration"
       ],
       [
-        "lines_changed",
-        "duration",
+        "context_trend",
+        "tokens_raw",
+        "spacer",
         "tools",
         "turns",
         "load",
-        "version"
+        "cloud_profile",
+        "k8s_context",
+        "python_env",
+        "toolchain"
       ]
     ]
   },
@@ -167,6 +177,8 @@
       "flex": true,
       "min_width": 15,
       "bar_width": 10,
+      "bar_style": "block",
+      "gradient": true,
       "thresholds": {
         "warn": 50,
         "danger": 70,
@@ -174,7 +186,7 @@
       }
     },
     "context_usage": {
-      "enabled": false,
+      "enabled": true,
       "priority": 2,
       "capacity": 200000,
       "thresholds": {
@@ -210,14 +222,16 @@
       "priority": 3
     },
     "cost_trend": {
-      "enabled": false,
+      "enabled": true,
       "priority": 3,
-      "width": 8
+      "width": 12,
+      "gradient": true
     },
     "context_trend": {
-      "enabled": false,
+      "enabled": true,
       "priority": 3,
-      "width": 8,
+      "width": 12,
+      "gradient": true,
       "thresholds": {
         "warn": 50,
         "danger": 70,
@@ -237,6 +251,8 @@
       "priority": 2,
       "min_width": 6,
       "show_last_name": true,
+      "show_breakdown": true,
+      "top_n": 7,
       "ttl": 2
     },
     "turns": {
@@ -265,6 +281,23 @@
     "hostname": {
       "enabled": true,
       "priority": 3
+    },
+    "cloud_profile": {
+      "enabled": true,
+      "priority": 2
+    },
+    "k8s_context": {
+      "enabled": true,
+      "priority": 3,
+      "ttl": 30
+    },
+    "python_env": {
+      "enabled": true,
+      "priority": 3
+    },
+    "toolchain": {
+      "enabled": true,
+      "priority": 3
     }
   },
   "custom": []