Add reflected memory and update decompose/orchestrate skills

Adds decisions and process-lessons from recent reflections.
Updates decompose and orchestrate SKILL.md with operational improvements.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills/decompose/SKILL.md

@@ -63,6 +63,8 @@ For each subtask, determine:
 - **End every prompt with:** "Run `pytest tests/ -v --tb=short` and fix any failures before finishing. Write a session log to memory/log/ when done."
 - **State import conventions explicitly** in prompts — e.g., "Use `from module import X`, not `from .module import X`" when source dirs aren't packages
 - **Before writing .agent-tasks.json, warn the user to commit WIP** if there are untracked/uncommitted files that agents will need. Worktrees only see committed content.
+- **Set the `model` field** for each task. Use `claude-opus-4-20250514` for research, architecture, and complex reasoning tasks. Use `claude-sonnet-4-20250514` (or omit for default) for code generation, testing, and mechanical tasks. Ask the user if unsure.
+- **Do NOT include "use web search" in prompts.** Container agents cannot web search. If a task requires current data verification, note this in the task description so the user can validate from their main session after the agent completes.
 
 ### Step 3: Present the task graph
 
@@ -102,6 +104,7 @@ Once approved, write `.agent-tasks.json` in the project root:
     "<task-id>": {
       "name": "<human readable name>",
       "prompt": "<full prompt for container agent>",
+      "model": "<optional model override, e.g. claude-opus-4-20250514>",
       "depends_on": ["<task-id>", ...],
       "reads": ["<file paths the agent should read>"],
       "writes": ["<file paths the agent will create/modify>"],