feat: package as Claude Code plugin with marketplace distribution

- Add .claude-plugin/plugin.json manifest for direct installation
- Add .claude-plugin/marketplace.json for marketplace distribution
- Reorganize skills to proper skill-name/SKILL.md format
- Update hooks.json with relative paths for portability
- Add new skills: continuous-learning, strategic-compact, eval-harness, verification-loop
- Add new commands: checkpoint, eval, orchestrate, verify
- Update README with plugin installation instructions

Install via:
  /plugin marketplace add affaan-m/everything-claude-code
  /plugin install everything-claude-code@everything-claude-code

hooks/hooks.json

@@ -47,7 +47,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "~/.claude/hooks/strategic-compact/suggest-compact.sh"
+            "command": "./hooks/strategic-compact/suggest-compact.sh"
           }
         ],
         "description": "Suggest manual compaction at logical intervals"
@@ -59,7 +59,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "~/.claude/hooks/memory-persistence/pre-compact.sh"
+            "command": "./hooks/memory-persistence/pre-compact.sh"
           }
         ],
         "description": "Save state before context compaction"
@@ -71,7 +71,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "~/.claude/hooks/memory-persistence/session-start.sh"
+            "command": "./hooks/memory-persistence/session-start.sh"
           }
         ],
         "description": "Load previous context on new session"
@@ -135,7 +135,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "~/.claude/hooks/memory-persistence/session-end.sh"
+            "command": "./hooks/memory-persistence/session-end.sh"
           }
         ],
         "description": "Persist session state on end"
@@ -145,7 +145,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "~/.claude/skills/continuous-learning/evaluate-session.sh"
+            "command": "./skills/continuous-learning/evaluate-session.sh"
           }
         ],
         "description": "Evaluate session for extractable patterns"