chore(licence): migrate Cargo.toml from PMPL-1.0-or-later to MPL-2.0

[hyperpolymath]

Summary

• Updates Cargo.toml license field from PMPL-1.0-or-later to MPL-2.0.
• Closes the SPDX-vs-manifest mismatch flagged by standards#196 (estate licence-debt audit, 2026-05-26).
• Aligns this repo with the estate policy of MPL-1.0/PMPL-1.0 → MPL-2.0 migration.

What this PR does NOT do

This is the manifest field only. The LICENSE file (if it carries a Palimpsest preamble) keeps that preamble — the load-bearing MPL-2.0 text is unchanged.

Companion

• standards#196 — licence debt audit
• standards#201 — licence-consistency CI check (will catch future drift)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 30 issues detected

Severity	Count
🔴 Critical	7
🟠 High	8
🟡 Medium	15

⚠️ 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": "Admitted leaves proof hole (5 occurrences, CWE-704)",
    "type": "admitted",
    "file": "/home/runner/work/ephapax/ephapax/formal/Semantics.v",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "Coq admit tactic leaves goal unproven (6 occurrences, CWE-704)",
    "type": "coq_admit_tactic",
    "file": "/home/runner/work/ephapax/ephapax/formal/Semantics.v",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "User-defined Coq axiom -- not verified by kernel (2 occurrences, CWE-704)",
    "type": "coq_axiom",
    "file": "/home/runner/work/ephapax/ephapax/formal/Semantics.v",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
    "type": "believe_me",
    "file": "/home/runner/work/ephapax/ephapax/src/formal/Ephapax/Formal/RegionLinear.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "assert_total bypasses totality checker (1 occurrences, CWE-704)",
    "type": "assert_total",
    "file": "/home/runner/work/ephapax/ephapax/src/formal/Ephapax/Formal/RegionLinear.idr",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/ephapax/ephapax/src/ephapax-repl/src/lib.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "from_raw constructs types from raw pointers without safety checks (1 occurrences, CWE-676)",
    "type": "from_raw",
    "file": "/home/runner/work/ephapax/ephapax/src/ephapax-vram-cache/src/lib.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "unwrap() without prior check -- DoS via panic (8 occurrences, CWE-754)",
    "type": "unwrap_without_check",
    "file": "/home/runner/work/ephapax/ephapax/src/ephapax-vram-cache/benches/cache_bench.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "reason": "expect() in hot path (5 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/ephapax/ephapax/src/ephapax-typing/src/lib.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  }
]

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