fix: rename save_memory and fix MCP search instructions + startup hook (#1210)

* fix: rename save_memory to save_observation and fix MCP search instructions

Stop the primary agent from proactively saving memories by renaming
save_memory to save_observation with a neutral description. Remove
"Saving Memories" section from SKILL.md. Update context formatters
and output styles to reference the mem-search skill instead of raw
MCP tool names.

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

* fix: split SessionStart hooks so smart-install failure doesn't block worker start

smart-install.js and worker-start were in the same hook group, so if
smart-install exited non-zero the worker never started. Split into
separate hook groups so they run independently.

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

* fix: worker startup waits for readiness before hooks fire

Move initializationCompleteFlag to set after DB/search init (not MCP),
add waitForReadiness() polling /api/readiness, and extract shared
pollEndpointUntilOk helper to DRY up health/readiness checks.

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

plugin/hooks/hooks.json

@@ -21,7 +21,12 @@
             "type": "command",
             "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/smart-install.js\"",
             "timeout": 300
-          },
+          }
+        ]
+      },
+      {
+        "matcher": "startup|clear|compact",
+        "hooks": [
           {
             "type": "command",
             "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/bun-runner.js\" \"${CLAUDE_PLUGIN_ROOT}/scripts/worker-service.cjs\" start",