docs: update CODING_STANDARDS.md:47 stale pysnmp 6.x reference

[commitconfirm]

Summary

docs/CODING_STANDARDS.md:47 references bulkCmd (pysnmp 6.x
camelCase) as the canonical SNMP example. The codebase is fully on
pysnmp 7.x as of issue #1; this doc reference is now stale.

Current text

SNMP uses pysnmp's async HLAPI (bulkCmd as coroutine — see
Phase 2.8 lessons learned for pysnmp 6.x specifics)

Proposed change

• Rename bulkCmd -> bulk_cmd to match the actual 7.x code
• Drop the "pysnmp 6.x specifics" parenthetical (no longer relevant
  as canonical guidance; Phase 2.8 history is preserved in
  .claude/CLAUDE.md for archival purposes)

Scope

Two-line change in one file. Independent of any other work — safe to
land any time before v1.0.1.

Acceptance criteria

• docs/CODING_STANDARDS.md:47 no longer references bulkCmd or
  "pysnmp 6.x specifics" as canonical guidance
• No other doc references to 6.x camelCase API names remain in
  docs/ (verify with /bin/grep -rn "getCmd\|nextCmd\|bulkCmd\|setCmd" docs/)

Labels

documentation, v1.0.1