chore(gitignore): ignore generated .verisim/ sidecar artifacts

[hyperpolymath]

Salvages the one valuable, complete commit from claude/gracious-curie-HS03A (created in another session) so it lands on main and the branch can be retired.

Change

Adds a .gitignore rule for .verisim/ — the default sidecar store, verisimiser generate scaffolds, and the <path>.lock write-locks introduced by the JSON-family work (V-L2-F3/F4) all live there and are runtime data, not source. Atomic-write temp files are already covered by the existing *.tmp rule.

Safety

Verified no tracked files live under .verisim/ (so nothing currently committed gets hidden) — the change is purely additive ignore coverage. Zero source/code changes.

Tidy-up tail of the V-L2-F* arc (F2 drop → F3 implement → F4 harden); no ADR warranted for a .gitignore chore.

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Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 82 issues detected

Severity	Count
🔴 Critical	3
🟠 High	7
🟡 Medium	72

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action perpolymath/standards/.github/workflows/governance-reusable.yml@main\n needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action dtolnay/rust-toolchain@stable needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action actions/checkout@v4 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Action dtolnay/rust-toolchain@master needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Action Swatinem/rust-cache@v2 needs attention",
    "type": "unpinned_action",
    "file": "rust-ci.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in boj-build.yml",
    "type": "missing_timeout_minutes",
    "file": "boj-build.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in casket-pages.yml",
    "type": "missing_timeout_minutes",
    "file": "casket-pages.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  }
]

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