chore(ci): replace secret-scanner.yml with reusable wrapper

[hyperpolymath]

Summary

Replaces this repo's secret-scanner.yml (~75-116 lines) with a thin ~14-line wrapper calling hyperpolymath/standards/.github/workflows/secret-scanner-reusable.yml@3e4bd4c93911750727e2e4c66dff859e00079da0 (merged via standards#190).

Security debt closed

The shell-secrets job (added to the canonical 2026-05-21 in direct response to the live Cloudflare API token leak via avow-protocol/deploy-repos.sh — a leak both trufflehog --only-verified and default gitleaks missed) was carried by 0 of 16 sampled estate copies. This PR brings that guardrail to this repo.

Why now

Estate audit: 281 secret-scanner.yml deployments / 54 unique SHAs / 19% true drift. Drift is pin churn + whitespace; feature variance is near-zero. Converging behind the reusable means the next post-incident guardrail update propagates via one SHA bump.

secrets: inherit flows GITHUB_TOKEN through implicitly so the gitleaks-action step doesn't fall back to anonymous (rate-limited) mode.

Part of estate-wide convergence campaign 2026-05-26 (standards#199 / #190).

[github-actions]

🔍 Hypatia Security Scan

Findings: 32 issues detected

Severity	Count
🔴 Critical	2
🟠 High	20
🟡 Medium	10

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
    "file": "governance.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "codeql.yml lists `language: javascript-typescript` but the repo has no source files in any CodeQL-scannable language. The analyze job will exit 'no source files' on every run. Switch the matrix to `actions` (which scans workflow files — every repo has those).",
    "type": "codeql_language_matrix_mismatch",
    "file": "codeql.yml",
    "action": "switch_codeql_matrix_to_actions",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/palimpsest-plasma/palimpsest-plasma/plasma-parser/src/spdx/lexer.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (2 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/palimpsest-plasma/palimpsest-plasma/plasma-parser/src/spdx/catalog.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Download-and-execute pattern (curl|wget pipe to shell) -- verify integrity before execution (3 occurrences, CWE-494)",
    "type": "shell_download_then_run",
    "file": "/home/runner/work/palimpsest-plasma/palimpsest-plasma/setup.sh",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Nominal-only SAST in palimpsest-plasma: codeql.yml language matrix contains no language present in the repo and lacks `actions`, so CodeQL records zero results on every commit. Remediation: set the CodeQL matrix to `language: actions`.",
    "type": "StaticAnalysis",
    "file": "/home/runner/work/palimpsest-plasma/palimpsest-plasma",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  },
  {
    "reason": "Repository has 9 non-main remote branch(es). Policy: single main branch only.",
    "type": "GS007",
    "file": ".",
    "action": "delete_remote_branches",
    "rule_module": "git_state",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Scorecard): TokenPermissionsID -- Token-Permissions -- 0 day(s) old",
    "type": "CSA001",
    "file": ".github/workflows/hypatia-scan.yml",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/code_safety/unwrap_dangerous_default -- Hypatia code_safety: unwrap_dangerous_default -- 4 day(s) old",
    "type": "CSA001",
    "file": "plasma-parser/src/spdx/catalog.rs",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/code_safety/unwrap_dangerous_default -- Hypatia code_safety: unwrap_dangerous_default -- 4 day(s) old",
    "type": "CSA001",
    "file": "plasma-parser/src/spdx/lexer.rs",
    "action": "update",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  }
]

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