perf(ticket-082): measure docker volume sizes in parallel batches

[tom-sapletta-com]

fixos cleanup --docker-volumes --list took ~60 s on a host with 379 unused volumes, almost all in one sequential sudo -n du.

• Sizes measured in 8 parallel round-robin batches (ThreadPoolExecutor).
• Readable mountpoints use plain du; unreadable ones go straight to sudo -n du, so a partial size of an unreadable directory is never recorded.

Same host, same 379 volumes: 47.5 s → 13.0 s, identical 37.4 GB total.

Test: batching into _SIZE_WORKERS calls with complete results. Full suite 883 passed / 5 skipped; ruff clean; governance GOV-PASS.

🤖 Generated with Claude Code

[ifuri-validator-agent]

Validator approval after policy checks for exact head c623bd016133388f6dd0d890b722a053a351ade1.

Ticket: ticket-082
Correlation ID: local-semcod-fixos-pr-112-ticket-082
Model: openai/cursor-auto
Reviewed diff chunks: 1
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 1 diff chunk(s). The implementation parallelizes volume-size collection with bounded concurrency, routes top-level unreadable mountpoints through noninteractive sudo, and safely treats command errors or timeouts as unknown sizes. All required and observational checks passed, and no blocking correctness or security defects are evident in the visible diff.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.
Semantic review prerequisite: not_required; policy 676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7.

Actual PR impact radar

Exact range: f92edb837c3bf354a6e89a0da7b58f463e484397...c623bd016133388f6dd0d890b722a053a351ade1
Change digest: 690141b3949c1e4cdb079d46865a0e42421769a5cfb567b16c742ae7c809c347
Score: 48/100 (M), estimated 52 min, split recommended: true
Affected services/components: repository-wide/unclassified

Machine-readable radar JSONL and SVG

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Merge will be attempted after this approval when explicitly authorized. ## Decision record (recomputable)

DECISION D-082-4176
TICKET ticket-082
HEAD_SHA c623bd016133388f6dd0d890b722a053a351ade1
CORRELATION_ID local-semcod-fixos-pr-112-ticket-082
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
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VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "APPROVE" MODEL "openai/cursor-auto"
ASSERT VERDICT_AUTHORITY != "ADVISORY"