legal: font license texts on the ISO; permissive source-available MontaukOS license

- Ship each bundled font's license at 0:/os/licenses/: OFL-1.1 copies for
  JetBrains Mono, Noto Serif, and Roboto, and AGPLv3 + font-embedding
  exception for C059 (URW Base 35).
- THIRD-PARTY-NOTICES.txt gains sections for all four font families and
  now describes MontaukOS as source-available.
- license.txt rewritten as the MontaukOS Software License: use, study,
  modify, and redistribute freely with attribution; selling or bundling
  into commercial products still requires permission. Replaces the
  previous no-copy/no-modify/no-redistribute EULA.
- The MontaukOS license itself now also ships on the ISO
  (0:/os/licenses/LICENSE.txt, sourced from the website copy).
- man legal updated: license pointer + full third-party component list.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

montaukos.org/THIRD-PARTY-NOTICES.txt

@@ -1,8 +1,8 @@
 MontaukOS - Third-Party Notices
 ===============================
 
-MontaukOS is proprietary software governed by the MontaukOS Software License
-Agreement (see license.txt). It incorporates or is distributed together with the
+The MontaukOS system is source-available software governed by the MontaukOS Software
+License (see license.txt). It incorporates or is distributed together with the
 third-party components listed below, each of which remains the property of its
 respective owner and is provided under its own license. The notices and license
 texts in this file apply only to the corresponding third-party component and not
@@ -136,7 +136,7 @@ License: GNU General Public License, version 2 (GPLv2)
   PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
   IMPORTANT: The DOOM application (doom.elf) is licensed under GPLv2, separately
-  from MontaukOS itself. The MontaukOS Software License Agreement does NOT apply
+  from MontaukOS itself. The MontaukOS Software License does NOT apply
   to doom.elf or to the doomgeneric/DOOM source. The full GPLv2 license text is
   included on the MontaukOS ISO at 0:/os/licenses/GPL-2.0.txt.
 
@@ -174,7 +174,7 @@ License: GNU General Public License, version 3 (GPLv3)
   FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 
   IMPORTANT: The Flat Remix icons are licensed under GPLv3, separately from
-  MontaukOS itself. The MontaukOS Software License Agreement does NOT apply to
+  MontaukOS itself. The MontaukOS Software License does NOT apply to
   the icon files, which remain under GPLv3. The full GPLv3 license text is
   included on the MontaukOS ISO at 0:/os/licenses/GPL-3.0.txt.
 
@@ -189,6 +189,65 @@ License: GNU General Public License, version 3 (GPLv3)
   request: daniel@nexlink.cloud.
 
 
+================================================================================
+6. JetBrains Mono (font)
+================================================================================
+Shipped as TrueType font files on the ISO (0:/fonts/JetBrainsMono-*.ttf).
+
+  Copyright 2020 The JetBrains Mono Project Authors
+  (https://github.com/JetBrains/JetBrainsMono)
+
+License: SIL Open Font License, Version 1.1 (OFL-1.1), with Reserved Font Name
+"JetBrains Mono". The full license text is included on the MontaukOS ISO at
+0:/os/licenses/OFL-JetBrainsMono.txt.
+
+
+================================================================================
+7. Noto Serif (font)
+================================================================================
+Shipped as TrueType font files on the ISO (0:/fonts/NotoSerif-*.ttf).
+
+  Copyright 2022 The Noto Project Authors
+  (https://github.com/notofonts/latin-greek-cyrillic)
+
+License: SIL Open Font License, Version 1.1 (OFL-1.1), with Reserved Font Name
+"Noto". The full license text is included on the MontaukOS ISO at
+0:/os/licenses/OFL-NotoSerif.txt.
+
+
+================================================================================
+8. Roboto (font)
+================================================================================
+Shipped as TrueType font files on the ISO (0:/fonts/Roboto-*.ttf).
+
+  Copyright 2011 The Roboto Project Authors
+  (https://github.com/googlefonts/roboto-classic)
+
+License: SIL Open Font License, Version 1.1 (OFL-1.1), with Reserved Font Name
+"Roboto". The full license text is included on the MontaukOS ISO at
+0:/os/licenses/OFL-Roboto.txt.
+
+
+================================================================================
+9. C059 (font, URW Base 35 collection)
+================================================================================
+Shipped as TrueType font files on the ISO (0:/fonts/C059-*.ttf). C059 is a
+Century Schoolbook derivative from the URW Base 35 font collection by (URW)++
+Design and Development GmbH, distributed by Artifex Software.
+
+  Copyright (C) (URW)++ Design and Development GmbH
+  Upstream: https://github.com/ArtifexSoftware/urw-base35-fonts
+
+License: GNU Affero General Public License, version 3 (AGPLv3), with a special
+exception permitting embedding the fonts in PostScript or PDF documents
+regardless of the document's own license. The full license text, including the
+exception, is included on the MontaukOS ISO at 0:/os/licenses/AGPL-3.0-C059.txt.
+
+  The C059 fonts are licensed under AGPLv3, separately from MontaukOS itself.
+  The corresponding source for the fonts as shipped is the font files
+  themselves, available unmodified from the upstream repository above.
+
+
 ================================================================================
 For licensing inquiries regarding MontaukOS itself, contact: daniel@nexlink.cloud
 ================================================================================