ci: scorecard publish workflow — extract run steps to composite actions

[hyperpolymath]

Re-architecture (as requested) to fully clear the Hypatia scorecard_publish_with_run_step finding that persisted after #53.

Why the earlier split didn't clear it

The rule is file-level: any run: step in a workflow file that publishes OpenSSF Scorecard results trips it. The #53 job-split moved the score gate to its own job, but the run step stayed in the same file (and the gate must stay in-file to consume the scorecard SARIF artifact within one workflow run), so the finding persisted.

Fix

Extract all run logic out of the scorecard-publishing workflow into local composite actions, leaving scorecard-enforcer.yml with zero run: steps (verified):

• .github/actions/scorecard-gate — the minimum-score gate (consumes the SARIF).
• .github/actions/repo-security-checks — the SECURITY.md + unpinned-action checks.

The publish job (which holds the OIDC id-token) and the whole workflow file are now uses:-only; the score-gate and check-critical jobs uses: the composite actions after checkout. Behaviour is unchanged — only the structure moved.

Verification

All three YAML files pass yaml.safe_load; scorecard-enforcer.yml has 0 run: step keys; the composite actions carry the run logic (1 + 2 steps). This should clear the file-level Hypatia rule on the next scan.

🤖 Generated with Claude Code

https://claude.ai/code/session_01AqMopxUsgu78rg5fhWBUkk

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Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 13 issues detected

Severity	Count
🔴 Critical	0
🟠 High	5
🟡 Medium	8

View findings

[
  {
    "reason": "binary_to_term without :safe option -- deserialization attack (1 occurrences, CWE-502)",
    "type": "elixir_send_unsanitised",
    "file": "/home/runner/work/phronesis/phronesis/lib/phronesis/compiler.ex",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "Nominal-only SAST in phronesis: 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/phronesis/phronesis",
    "action": "auto_fix",
    "rule_module": "scorecard",
    "severity": "medium",
    "remediation": "Add CodeQL or equivalent SAST workflow.",
    "scorecard_check": "SAST"
  },
  {
    "reason": "Repository has 6 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 (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 8 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 8 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/structural_drift/SD007 -- Hypatia structural_drift: SD007 -- 8 day(s) old",
    "type": "CSA001",
    "file": ".claude/CLAUDE.md",
    "action": "review",
    "rule_module": "code_scanning_alerts",
    "severity": "medium"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/code_safety/elixir_send_unsanitised -- Hypatia code_safety: elixir_send_unsanitised -- 8 day(s) old [STALE]",
    "type": "CSA001",
    "file": "lib/phronesis/compiler.ex",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code scanning (Hypatia): hypatia/workflow_audit/scorecard_publish_with_run_step -- Hypatia workflow_audit: scorecard_publish_with_run_step -- 20 day(s) old [STALE]",
    "type": "CSA001",
    "file": "scorecard-enforcer.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code-scanning alert hypatia/code_safety/elixir_send_unsanitised (high) at lib/phronesis/compiler.ex is 8 days old (threshold: 7 days) -- overdue for remediation",
    "type": "CSA003",
    "file": "lib/phronesis/compiler.ex",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  },
  {
    "reason": "Code-scanning alert hypatia/workflow_audit/scorecard_publish_with_run_step (high) at scorecard-enforcer.yml is 20 days old (threshold: 7 days) -- overdue for remediation",
    "type": "CSA003",
    "file": "scorecard-enforcer.yml",
    "action": "escalate",
    "rule_module": "code_scanning_alerts",
    "severity": "high"
  }
]

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