perf(plugin): reduce PostToolUse hook per-call I/O

[JeremyDev87]

Summary

• HistoryDB singleton: get_instance()/close_instance() classmethods for DB connection reuse across tool calls (1 open per session instead of per-call)
• SessionStats in-memory accumulation: record_tool_call() accumulates in memory, auto-flushes every N calls (default 10) or on explicit flush()
• Conditional notification: checks config.notifications.enabled before importing notification modules — fully skips when disabled
• Stop hook integration: flushes pending stats + closes DB singleton at session end

Test plan

• 158 tests passing (143 existing + 15 new)
• HistoryDB singleton: identity, connection reuse, close/recreate, noop close (4 tests)
• SessionStats in-memory: no immediate write, flush works, auto-flush at interval, finalize flushes, summary reflects memory (5 tests)
• Conditional notification: skip when disabled, still notify when enabled (2 tests)
• Singleton wiring: uses get_instance not constructor, no close after each call (2 tests)
• Stop hook flush: calls flush() and close_instance() (2 tests)

Closes #931

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Project	Deployment	Actions	Updated (UTC)
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