chore(license): migrate to MPL-2.0 (#23)

## Summary
Migrates this repo's license declaration from `MPL-2.0 (no SPDX header)`
to `MPL-2.0`.

**Rationale:** solo.

## Changes
- LICENSE file replaced with canonical `MPL-2.0` text (including SPDX
header).
- Package metadata updated where present (Cargo.toml, package.json,
deno.json, mix.exs, pyproject.toml).

Part of estate-wide metadata cleanup 2026-05-26.

Author: hyperpolymath

LICENSE

@@ -1,27 +1,29 @@
+SPDX-License-Identifier: MPL-2.0
+
 Mozilla Public License Version 2.0
 ==================================
 
 1. Definitions
 --------------
 
-1.1. “Contributor”
+1.1. "Contributor"
     means each individual or legal entity that creates, contributes to
     the creation of, or owns Covered Software.
 
-1.2. “Contributor Version”
+1.2. "Contributor Version"
     means the combination of the Contributions of others (if any) used
-    by a Contributor and that particular Contributor’s Contribution.
+    by a Contributor and that particular Contributor's Contribution.
 
-1.3. “Contribution”
+1.3. "Contribution"
     means Covered Software of a particular Contributor.
 
-1.4. “Covered Software”
+1.4. "Covered Software"
     means Source Code Form to which the initial Contributor has attached
     the notice in Exhibit A, the Executable Form of such Source Code
     Form, and Modifications of such Source Code Form, in each case
     including portions thereof.
 
-1.5. “Incompatible With Secondary Licenses”
+1.5. "Incompatible With Secondary Licenses"
     means
 
     (a) that the initial Contributor has attached the notice described
@@ -31,22 +33,22 @@ Mozilla Public License Version 2.0
         version 1.1 or earlier of the License, but not also under the
         terms of a Secondary License.
 
-1.6. “Executable Form”
+1.6. "Executable Form"
     means any form of the work other than Source Code Form.
 
-1.7. “Larger Work”
-    means a work that combines Covered Software with other material, in
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in 
     a separate file or files, that is not Covered Software.
 
-1.8. “License”
+1.8. "License"
     means this document.
 
-1.9. “Licensable”
+1.9. "Licensable"
     means having the right to grant, to the maximum extent possible,
     whether at the time of the initial grant or subsequently, any and
     all of the rights conveyed by this License.
 
-1.10. “Modifications”
+1.10. "Modifications"
     means any of the following:
 
     (a) any file in Source Code Form that results from an addition to,
@@ -56,28 +58,28 @@ Mozilla Public License Version 2.0
     (b) any new file in Source Code Form that contains any Covered
         Software.
 
-1.11. “Patent Claims” of a Contributor
+1.11. "Patent Claims" of a Contributor
     means any patent claim(s), including without limitation, method,
     process, and apparatus claims, in any patent Licensable by such
     Contributor that would be infringed, but for the grant of the
     License, by the making, using, selling, offering for sale, having
     made, import, or transfer of either its Contributions or its
     Contributor Version.
 
-1.12. “Secondary License”
+1.12. "Secondary License"
     means either the GNU General Public License, Version 2.0, the GNU
     Lesser General Public License, Version 2.1, the GNU Affero General
     Public License, Version 3.0, or any later versions of those
     licenses.
 
-1.13. “Source Code Form”
+1.13. "Source Code Form"
     means the form of the work preferred for making modifications.
 
-1.14. “You” (or “Your”)
+1.14. "You" (or "Your")
     means an individual or a legal entity exercising rights under this
-    License. For legal entities, “You” includes any entity that
+    License. For legal entities, "You" includes any entity that
     controls, is controlled by, or is under common control with You. For
-    purposes of this definition, “control” means (a) the power, direct
+    purposes of this definition, "control" means (a) the power, direct
     or indirect, to cause the direction or management of such entity,
     whether by contract or otherwise, or (b) ownership of more than
     fifty percent (50%) of the outstanding shares or beneficial
@@ -118,7 +120,7 @@ Contributor:
 (a) for any code that a Contributor has removed from Covered Software;
     or
 
-(b) for infringements caused by: (i) Your and any other third party’s
+(b) for infringements caused by: (i) Your and any other third party's
     modifications of Covered Software, or (ii) the combination of its
     Contributions with other software (except as part of its Contributor
     Version); or
@@ -164,7 +166,7 @@ Modifications that You create or to which You contribute, must be under
 the terms of this License. You must inform recipients that the Source
 Code Form of the Covered Software is governed by the terms of this
 License, and how they can obtain a copy of this License. You may not
-attempt to alter or restrict the recipients’ rights in the Source Code
+attempt to alter or restrict the recipients' rights in the Source Code
 Form.
 
 3.2. Distribution of Executable Form
@@ -180,7 +182,7 @@ If You distribute Covered Software in Executable Form then:
 (b) You may distribute such Executable Form under the terms of this
     License, or sublicense it under different terms, provided that the
     license for the Executable Form does not attempt to limit or alter
-    the recipients’ rights in the Source Code Form under this License.
+    the recipients' rights in the Source Code Form under this License.
 
 3.3. Distribution of a Larger Work
 
@@ -203,6 +205,19 @@ or limitations of liability) contained within the Source Code Form of
 the Covered Software, except that You may alter any license notices to
 the extent required to remedy known factual inaccuracies.
 
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
 4. Inability to Comply Due to Statute or Regulation
 ---------------------------------------------------
 
@@ -250,7 +265,7 @@ prior to termination shall survive termination.
 *  6. Disclaimer of Warranty                                           *
 *  -------------------------                                           *
 *                                                                      *
-*  Covered Software is provided under this License on an “as is”       *
+*  Covered Software is provided under this License on an "as is"       *
 *  basis, without warranty of any kind, either expressed, implied, or  *
 *  statutory, including, without limitation, warranties that the       *
 *  Covered Software is free of defects, merchantable, fit for a        *
@@ -279,7 +294,7 @@ prior to termination shall survive termination.
 *  and all other commercial damages or losses, even if such party      *
 *  shall have been informed of the possibility of such damages. This   *
 *  limitation of liability shall not apply to liability for death or   *
-*  personal injury resulting from such party’s negligence to the       *
+*  personal injury resulting from such party's negligence to the       *
 *  extent applicable law prohibits such limitation. Some               *
 *  jurisdictions do not allow the exclusion or limitation of           *
 *  incidental or consequential damages, so this exclusion and          *
@@ -294,7 +309,7 @@ Any litigation relating to this License may be brought only in the
 courts of a jurisdiction where the defendant maintains its principal
 place of business and such litigation shall be governed by laws of that
 jurisdiction, without reference to its conflict-of-law provisions.
-Nothing in this Section shall prevent a party’s ability to bring
+Nothing in this Section shall prevent a party's ability to bring
 cross-claims or counter-claims.
 
 9. Miscellaneous
@@ -344,7 +359,7 @@ Exhibit A - Source Code Form License Notice
 
   This Source Code Form is subject to the terms of the Mozilla Public
   License, v. 2.0. If a copy of the MPL was not distributed with this
-  file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 If it is not possible or desirable to put the notice in a particular
 file, then You may include the notice in a location (such as a LICENSE
@@ -353,8 +368,8 @@ for such a notice.
 
 You may add additional accurate notices of copyright ownership.
 
-Exhibit B - “Incompatible With Secondary Licenses” Notice
+Exhibit B - "Incompatible With Secondary Licenses" Notice
 ---------------------------------------------------------
 
-  This Source Code Form is “Incompatible With Secondary Licenses”, as
+  This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.