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

[hyperpolymath]

Summary

• Updates Cargo.toml license field from PMPL-1.0 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: 43 issues detected

Severity	Count
🔴 Critical	4
🟠 High	26
🟡 Medium	13

⚠️ 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": "expect() in hot path (1 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/src/types.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/src/mlp.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "unwrap_or(0) with dangerous default (1 occurrences, CWE-754)",
    "type": "unwrap_dangerous_default",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/src/sensor.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "critical"
  },
  {
    "reason": "expect() in hot path (8 occurrences, CWE-754)",
    "type": "expect_in_hot_path",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/src/persistence.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "medium"
  },
  {
    "reason": "panic! macro causes unrecoverable crash (26 occurrences, CWE-754)",
    "type": "panic_macro",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/src/persistence.rs",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "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/heterogenous-mobile-computing/heterogenous-mobile-computing/setup.sh",
    "action": "flag",
    "rule_module": "code_safety",
    "severity": "high"
  },
  {
    "line": 204,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/SECURITY.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  },
  {
    "line": 205,
    "reason": "Secret found: Generic API key",
    "type": "secret_detected",
    "file": "/home/runner/work/heterogenous-mobile-computing/heterogenous-mobile-computing/SECURITY.md",
    "action": "revoke_rotate_and_purge",
    "rule_module": "security_errors",
    "severity": "critical"
  }
]

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