fix(licence): set top-level LICENSE to MPL-2.0 (owner-directed)

[hyperpolymath]

What

Sets standards' top-level LICENSE to MPL-2.0 (owner-directed 2026-06-02). The file previously declared AGPL-3.0-or-later with a body that didn't match any licence template.

Scope — LICENSE file only (no SPDX sweep)

standards is a deliberately multi-licensed repo — PMPL-1.0-or-later dominates its spec/template content (3644 files), alongside MPL-2.0, MIT, AGPL, Palimpsest-0.4, and CC-BY-SA. This PR changes only the top-level LICENSE file; per-file SPDX-License-Identifier headers are intentionally left untouched (no bulk SPDX sweep, per the estate no-sweep mandate). The repo's mixed per-file licensing is preserved exactly as-is.

Verified locally: check-licence-consistency.sh → [OK] Licence consistency check passed (standards has no root build manifest, so the gate validates the LICENSE SPDX + body alone; both now resolve to MPL-2.0).

---

Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 222 issues detected

Severity	Count
🔴 Critical	64
🟠 High	62
🟡 Medium	96

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action for the check script)\n        uses: actions/checkout@de0f needs attention",
    "type": "unpinned_action",
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    "severity": "medium"
  },
  {
    "reason": "Action for the check script)\n        uses: actions/checkout@de0f needs attention",
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  {
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    "severity": "medium"
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    "reason": "Issue in boj-build.yml",
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    "severity": "medium"
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    "reason": "Issue in casket-pages.yml",
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  {
    "reason": "Issue in changelog-reusable.yml",
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    "action": "flag",
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  {
    "reason": "Issue in codeql-reusable.yml",
    "type": "missing_timeout_minutes",
    "file": "codeql-reusable.yml",
    "action": "flag",
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    "severity": "medium"
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    "reason": "Issue in codeql.yml",
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    "severity": "medium"
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  {
    "reason": "Issue in deno-ci-reusable.yml",
    "type": "missing_timeout_minutes",
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    "action": "flag",
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]

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