fix: add try-catch to inline hooks, fix schema drift

- Wrap JSON.parse in try-catch for all 6 inline hooks in hooks.json
  (dev-server blocker, tmux reminder, git-push reminder, doc blocker,
  PR create logger, build analysis) — previously unguarded JSON.parse
  would crash on empty/malformed stdin, preventing data passthrough
- Add config parse error logging to evaluate-session.js
- Fix plugin.schema.json: author can be string or {name,url} object,
  add version (semver pattern), homepage, keywords, skills, agents
- Fix package-manager.schema.json: add setAt (date-time) field and
  make packageManager required to match actual code behavior

scripts/hooks/evaluate-session.js

@@ -41,8 +41,8 @@ async function main() {
         // Handle ~ in path
         learnedSkillsPath = config.learned_skills_path.replace(/^~/, require('os').homedir());
       }
-    } catch {
-      // Invalid config, use defaults
+    } catch (err) {
+      log(`[ContinuousLearning] Failed to parse config: ${err.message}, using defaults`);
     }
   }