chore(v→zig): delete legacy V-lang API shim

[hyperpolymath]

Summary

Estate-wide V-lang→Zig remediation per the 2026-05-28 owner directive.
Deletes api/v/conflow.v (a thin V-lang wrapper that called into the
already-existing Zig FFI at ffi/zig/). With V removed from the estate,
the Zig FFI is the canonical API surface; no replacement needed.

Test plan

• Hypatia rule `cicd_rules/vlang_detected` (in the parallel hypatia PR) does not flag this repo post-merge

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 92 issues detected

Severity	Count
🔴 Critical	1
🟠 High	15
🟡 Medium	76

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Issue in boj-build.yml",
    "type": "unknown",
    "file": "boj-build.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "unknown",
    "file": "cargo-audit.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cargo-audit.yml",
    "type": "unknown",
    "file": "cargo-audit.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "unknown",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "unknown",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_batch.yml",
    "type": "unknown",
    "file": "cflite_batch.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in cflite_pr.yml",
    "type": "unknown",
    "file": "cflite_pr.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "unknown",
    "file": "codeql.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dependabot-automerge.yml",
    "type": "unknown",
    "file": "dependabot-automerge.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in dogfood-gate.yml",
    "type": "unknown",
    "file": "dogfood-gate.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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