docs: add licensing and attribution files

LICENSE

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+MIT License
+
+Copyright (c) 2024-2026 Everruns
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

NOTICE

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+BashKit
+Copyright (c) 2024-2026 Everruns
+
+This product is an independent implementation of a sandboxed bash interpreter.
+
+================================================================================
+ACKNOWLEDGMENTS
+================================================================================
+
+BashKit is an independent implementation that draws design inspiration from
+several open source projects. We gratefully acknowledge:
+
+--------------------------------------------------------------------------------
+just-bash
+--------------------------------------------------------------------------------
+Copyright (c) Vercel Inc.
+Licensed under the Apache License, Version 2.0
+
+Repository: https://github.com/vercel/just-bash
+
+BashKit's sandboxing architecture and multi-tenant design was inspired by
+just-bash's approach to safe bash execution. No code was copied; this is an
+independent Rust implementation.
+
+--------------------------------------------------------------------------------
+Oils (formerly Oil Shell)
+--------------------------------------------------------------------------------
+Copyright (c) Andy Chu and contributors
+Licensed under the Apache License, Version 2.0
+
+Repository: https://github.com/oilshell/oil
+
+The Oils project's comprehensive bash compatibility testing approach inspired
+our spec test methodology. Our test cases are independently written following
+similar testing principles.
+
+--------------------------------------------------------------------------------
+One True AWK
+--------------------------------------------------------------------------------
+Copyright (c) Lucent Technologies
+Licensed under the Lucent Public License
+
+Repository: https://github.com/onetrueawk/awk
+
+The behavior and semantics of our AWK builtin implementation are informed by
+the One True AWK specification. Our implementation is written from scratch in
+Rust using the original AWK language definition as reference.
+
+--------------------------------------------------------------------------------
+jq
+--------------------------------------------------------------------------------
+Copyright (c) Stephen Dolan
+Licensed under the MIT License
+
+Repository: https://github.com/jqlang/jq
+
+Our jq builtin aims for compatibility with jq's query syntax and behavior.
+The implementation uses the jaq Rust crates (MIT licensed) rather than jq
+source code directly.
+
+================================================================================
+RUST DEPENDENCIES
+================================================================================
+
+BashKit uses the following notable Rust crates. Full dependency information
+is available via `cargo tree` or in the Cargo.lock file.
+
+jaq-core, jaq-std, jaq-json (MIT)
+  - JQ expression parsing and evaluation
+  - Copyright (c) Michael Färber
+
+grep, grep-regex, grep-searcher (MIT/Apache-2.0)
+  - Text search functionality
+  - Part of the ripgrep project by Andrew Gallant
+
+tokio (MIT)
+  - Async runtime
+  - Copyright (c) Tokio Contributors
+
+serde, serde_json (MIT/Apache-2.0)
+  - Serialization framework
+  - Copyright (c) David Tolnay and serde contributors
+
+regex (MIT/Apache-2.0)
+  - Regular expression engine
+  - Copyright (c) The Rust Project Developers
+
+All dependencies are permissively licensed (MIT, Apache-2.0, BSD, ISC, Zlib).
+See THIRD_PARTY_LICENSES/ for full license texts of key dependencies.
+
+================================================================================
+INDEPENDENT IMPLEMENTATION NOTICE
+================================================================================
+
+BashKit is an independent implementation of a bash-like shell interpreter.
+It is not affiliated with, endorsed by, or derived from:
+
+- GNU Bash (GPL licensed)
+- The original Bourne shell
+- Any of the projects mentioned above
+
+The shell syntax parser, interpreter, virtual filesystem, and all builtins
+(except where noted) are original implementations written in Rust.

THIRD_PARTY_LICENSES/APACHE-2.0.txt

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+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
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+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
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+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
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+      institute patent litigation against any entity (including a
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+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+
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+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
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+      may provide additional or different license terms and conditions
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+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
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+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+--------------------------------------------------------------------------------
+This license applies to:
+- just-bash (Vercel Inc.)
+- Oils project (Andy Chu and contributors)
+--------------------------------------------------------------------------------

THIRD_PARTY_LICENSES/LUCENT.txt

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+Lucent Public License Version 1.02
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of a copyright holder shall
+not be used in advertising or otherwise to promote the sale, use or other
+dealings in this Software without prior written authorization of the
+copyright holder.
+
+The complete Lucent Public License Version 1.02 is available at:
+https://opensource.org/licenses/LPL-1.02
+
+--------------------------------------------------------------------------------
+This license applies to:
+- One True AWK (Lucent Technologies / Brian Kernighan)
+  Repository: https://github.com/onetrueawk/awk
+
+  BashKit's AWK builtin implementation is informed by the One True AWK
+  language specification and behavior, but is an independent implementation
+  written from scratch in Rust.
+--------------------------------------------------------------------------------

THIRD_PARTY_LICENSES/MIT.txt

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+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+--------------------------------------------------------------------------------
+This license applies to:
+- jq (Stephen Dolan)
+- jaq Rust crates (Michael Färber)
+- Many Rust dependencies (see Cargo.lock for full list)
+--------------------------------------------------------------------------------