feat(diagnostics): accelerate session hosts inspection via native proc scan

[tom-sapletta-com]

Accelerate session hosts inspection and process ancestry tree traversal via native Rust proc scan with 100% Python parity and fallback.

[ifuri-validator-agent]

Validator approval after policy checks for exact head fab9fcfd01769983a0d710ef6bbb6d03346b4c56.

Ticket: ticket-022
Correlation ID: local-semcod-uncrash-pr-21-ticket-022
Model: openai/cursor-auto
Reviewed diff chunks: 3
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 3 diff chunk(s). The diff implements the native Rust proc scan for session hosts with a robust 100% Python fallback. The subprocess.run call is properly protected with timeouts and error handling, and the /proc/[pid]/stat parsing in Rust correctly handles process names containing spaces or parentheses by using the last parenthesis index. | The process traversal and metadata extraction logic in Rust looks solid. Appropriate bounded limits and JSON escaping are correctly applied to prevent resource exhaustion and JSON injection. | Diff adds --session-hosts flag to the Rust snapshot binary and tests in Python verifying parity between native and Python implementations, along with validation for symlink proc directory refusal.
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: d13a5b50660d22d66893092ad3549266b9735ac7...fab9fcfd01769983a0d710ef6bbb6d03346b4c56
Change digest: 4b961b2766a5f3acf9f2c02e245381ae3c92129a34a4efa7f971fea6fcb7f93b
Score: 48/100 (M), estimated 60 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-022-7761
TICKET ticket-022
HEAD_SHA fab9fcfd01769983a0d710ef6bbb6d03346b4c56
CORRELATION_ID local-semcod-uncrash-pr-21-ticket-022
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"