feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)

ECC community plugin pruning: removed 530+ non-essential files
(.cursor/, .opencode/, docs/ja-JP, docs/zh-CN, docs/zh-TW,
language-specific skills/agents/rules). Retained 4 agents,
3 commands, 5 skills. Promoted 13 rule files (8 common + 5
typescript) to .claude/rules/ for CC native loading. Extracted
reusable patterns to EXTRACTED-PATTERNS.md.

skills/strategic-compact/suggest-compact.sh

@@ -1,54 +0,0 @@
-#!/bin/bash
-# Strategic Compact Suggester
-# Runs on PreToolUse or periodically to suggest manual compaction at logical intervals
-#
-# Why manual over auto-compact:
-# - Auto-compact happens at arbitrary points, often mid-task
-# - Strategic compacting preserves context through logical phases
-# - Compact after exploration, before execution
-# - Compact after completing a milestone, before starting next
-#
-# Hook config (in ~/.claude/settings.json):
-# {
-#   "hooks": {
-#     "PreToolUse": [{
-#       "matcher": "Edit|Write",
-#       "hooks": [{
-#         "type": "command",
-#         "command": "~/.claude/skills/strategic-compact/suggest-compact.sh"
-#       }]
-#     }]
-#   }
-# }
-#
-# Criteria for suggesting compact:
-# - Session has been running for extended period
-# - Large number of tool calls made
-# - Transitioning from research/exploration to implementation
-# - Plan has been finalized
-
-# Track tool call count (increment in a temp file)
-# Use CLAUDE_SESSION_ID for session-specific counter (not $$ which changes per invocation)
-SESSION_ID="${CLAUDE_SESSION_ID:-${PPID:-default}}"
-COUNTER_FILE="/tmp/claude-tool-count-${SESSION_ID}"
-THRESHOLD=${COMPACT_THRESHOLD:-50}
-
-# Initialize or increment counter
-if [ -f "$COUNTER_FILE" ]; then
-  count=$(cat "$COUNTER_FILE")
-  count=$((count + 1))
-  echo "$count" > "$COUNTER_FILE"
-else
-  echo "1" > "$COUNTER_FILE"
-  count=1
-fi
-
-# Suggest compact after threshold tool calls
-if [ "$count" -eq "$THRESHOLD" ]; then
-  echo "[StrategicCompact] $THRESHOLD tool calls reached - consider /compact if transitioning phases" >&2
-fi
-
-# Suggest at regular intervals after threshold
-if [ "$count" -gt "$THRESHOLD" ] && [ $((count % 25)) -eq 0 ]; then
-  echo "[StrategicCompact] $count tool calls - good checkpoint for /compact if context is stale" >&2
-fi