Align all PMIDs with real Linux PMDA assignments

[tallpsmith]

Summary

• Fix 47 PMIDs across all 5 domain modules to match real Linux PMDA (src/pmdas/linux/pmda.c)
• Eliminate invented domain 58 (memory) — all metrics now use domain 60
• Move disk metrics from invented clusters 4/5 to real CLUSTER_STAT=0
• Move percpu metrics from invented cluster 10 to real CLUSTER_STAT=0
• Fix metadata: kernel.uname.* cluster 9→12, hinv.physmem/pagesize to CLUSTER_MEMINFO=1
• Rename disk.dev.avg_qlen → disk.dev.aveq to match real Linux metric name
• Update CLAUDE.md to document alignment approach (replaces "intentionally non-standard" note)

Domains affected

Domain	Metrics fixed	Key change
CPU	6	idle/nice/steal items, percpu cluster 10→0
System	1	pswitch item 7→13
Disk	16	clusters 4/5→0, all items, avg_qlen→aveq rename
Memory	13	domain 58→60, clusters realigned
Metadata	9	uname cluster 9→12, hinv items

Test plan

• All PMID test assertions updated before implementation (TDD)
• disk.dev.avg_qlen → disk.dev.aveq renamed in code, CLI, and all tests
• 463 unit/integration + 7 E2E tests green
• ruff, mypy, mandoc all clean
• ./pre-commit.sh passes

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