Add decompose + orchestrate skills with operational improvements

New skills for container agent task orchestration:
- /decompose: break tasks into subtasks with dependency graph, write .agent-tasks.json
- /orchestrate: check task state, launch container agents in git worktrees, poll for completion

Updated with learnings from first real run (agent-runtimes M3, 9 tasks):
- Prompts must end with "run pytest and fix failures"
- State import conventions explicitly in prompts
- Warn about uncommitted files before decomposing (worktrees need committed content)
- Copy dependency outputs into downstream worktrees before launching

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

CLAUDE.md

@@ -13,8 +13,15 @@ custom-claude-skills/
 ├── scripts/
 │   └── install.sh         # Symlinks all skills into ~/.claude/skills/
 └── skills/
-    └── reflect/
-        └── SKILL.md       # Milestone reflection skill
+    ├── context-load/SKILL.md       # Reload project context
+    ├── decompose/SKILL.md          # Task decomposition for container agents
+    ├── distill-best-practices/SKILL.md # Cross-project best practices
+    ├── housekeeping/SKILL.md       # Cross-project health check
+    ├── linter/SKILL.md             # Format/lint audit and execution
+    ├── log/SKILL.md                # End-of-session logging
+    ├── orchestrate/SKILL.md        # Container agent dispatch with git worktrees
+    ├── reflect/SKILL.md            # Milestone reflection
+    └── reflect-logs/SKILL.md       # Process logs into memory
 ```
 
 ## Conventions