docs: narrative alignment for 2026-05-28 PRs #147 #148 #149 + guardrails policy

[hyperpolymath]

Four narrative-alignment edits after the post-compact session:

• CONTRIBUTING.md: add Pre-merge checklist item E5 scaffolding: Omega markers and Buchholz core modules #5 documenting `tools/check-guardrails.sh` (the CI-enforced no-postulates + mandatory `--safe --without-K` policy across `proofs/agda/**`). PR echo(image-factorization-prop): postulated-truncation consumer + Exploratory classification #148 (postulated `EchoImageFactorizationPropPostulated` consumer) was closed precisely because this guardrail was not discoverable in user-facing docs. Critical — addresses a real contributor gotcha.
• docs/echo-types/MAP.adoc: index the two new Buchholz modules from this session — `RankLexJointBplus` (PR ordinal(buchholz): rank-lex-jb scaffold — parallel rank with richer bplus second component #147) and `RankMonoUmbrellaSlice4` (PR ordinal(buchholz): Slice 4 narrowing — _<ᵇ⁻ⁿ_ umbrella covering today's closed cases #149) — alongside the existing Slice 3 trio.
• roadmap.adoc: refresh Lane 3 status — Slice 3 + Slice 4 both LANDED 2026-05-28 with the two constructor-level shortfalls pinned as `⊤`-aliases; bottleneck moves to unbudgeted `<ᵇʳᶠ` global WF.
• README.md: Ordinal track one-line ledger gains 2026-05-28 Slice 3 + Slice 4 entry.

Pure narrative — no Agda touched, no proof obligations changed.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 56 issues detected

Severity	Count
🔴 Critical	17
🟠 High	22
🟡 Medium	17

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "No test directory or test files found",
    "type": "no_tests",
    "file": "/home/runner/work/echo-types/echo-types",
    "action": "flag",
    "rule_module": "honest_completion",
    "severity": "high",
    "deduction": 20
  },
  {
    "reason": "Issue in codeql.yml",
    "type": "missing_workflow",
    "file": "codeql.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in secret-scanner.yml",
    "type": "missing_workflow",
    "file": "secret-scanner.yml",
    "action": "create",
    "rule_module": "workflow_audit",
    "severity": "high"
  },
  {
    "reason": "Issue in agda.yml",
    "type": "unknown",
    "file": "agda.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in agda.yml",
    "type": "unknown",
    "file": "agda.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in governance.yml",
    "type": "unknown",
    "file": "governance.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in hypatia-scan.yml",
    "type": "unknown",
    "file": "hypatia-scan.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in mirror.yml",
    "type": "unknown",
    "file": "mirror.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Issue in scorecard.yml",
    "type": "unknown",
    "file": "scorecard.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
    "severity": "medium"
  },
  {
    "reason": "Agda postulate assumes without proof -- potential soundness hole (1 occurrences, CWE-704)",
    "type": "agda_postulate",
    "file": "/home/runner/work/echo-types/echo-types/tutorial/epistemic_erasure/EpistemicErasure.agda",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  }
]

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