docs: add Copyright + StrayMark notice; SPDX headers on Rust sources (#17)

* docs: add StrayMark/AI notice + Copyright section to README; SPDX headers on sources

- README: add "Built with AI · Powered by StrayMark" and "Copyright" sections
  mirroring the format used in StrangeDaysTech/arborist-metrics, adapted to
  this CLI's surface (clap, table/JSON/CSV output, self-update, 29-test
  integration suite).
- Add SPDX-License-Identifier + Copyright header to every Rust source under
  src/ and tests/cli/ (in line with the Rust ecosystem convention and the
  identical change made in arborist-metrics v0.1.3).
- tests/fixtures/*.rs intentionally left untouched — those files are inputs
  to the analyzer in integration tests; modifying them would change the
  expected metrics.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* style: restore trailing newlines stripped by SPDX header script

The shell loop that prepended the SPDX header used `$(cat ...)` which
strips trailing newlines, leaving every patched file without its final
`\n`. cargo fmt --check (run in CI) flagged all 20 files. Running
cargo fmt restores the trailing newline; no semantic changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: montfort

README.md

@@ -296,6 +296,23 @@ File bugs and feature requests at [GitHub Issues](https://github.com/StrangeDays
 
 We welcome patches! Please read [CONTRIBUTING.md](CONTRIBUTING.md) before submitting a PR. All contributors must sign the **Contributor License Agreement (CLA)** — the CLA bot will guide you on your first pull request.
 
+## Built with AI · Powered by StrayMark
+
+`arborist-cli` is an experiment in **disciplined AI-assisted development**.
+The implementation — the `clap`-derived CLI surface, the three output
+formats (table / JSON / CSV), the directory traversal layer, self-update
+from GitHub Releases, and the 29-test integration suite — was authored
+largely by AI agents under human direction.
+
+To make that velocity sustainable, we use **[StrayMark](https://straymark.dev)**:
+a CLI for *cognitive discipline in AI-assisted engineering*. It turned every
+architectural choice into an AIDEC record and every implementation block into
+an AILOG — all under `.straymark/`, append-only and audit-ready. The
+governance artifacts emerged **alongside** the code, not as homework after.
+
+> StrayMark is built by Strange Days Tech — the same team behind `arborist-cli`.
+> It is the tool we made to solve our own problem.
+
 ## License
 
 Licensed under either of
@@ -306,3 +323,13 @@ Licensed under either of
 at your option.
 
 Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
+
+---
+
+## Copyright
+
+**`arborist-cli`** is © 2026 **[Strange Days Tech S.A.S. de C.V.](https://strangedays.tech/)** — original author and intellectual-property holder of the source code.
+
+The CLI is released under the dual MIT / Apache-2.0 license above; this notice records authorship and does **not** modify those license terms. Each source file carries an SPDX header reflecting the same.
+
+> Built by **[Strange Days Tech](https://strangedays.tech/)** — México.

src/about.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub fn print() {
     let version = env!("CARGO_PKG_VERSION");
     let description = env!("CARGO_PKG_DESCRIPTION");

src/analysis.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io::Read;
 use std::path::{Path, PathBuf};
 

src/cli.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::path::PathBuf;
 
 use clap::{Parser, Subcommand, ValueEnum};

src/error.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::process::ExitCode;
 
 #[derive(Debug, thiserror::Error)]

src/lib.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub mod about;
 pub mod analysis;
 pub mod cli;

src/main.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::process::ExitCode;
 
 use clap::Parser;

src/output/csv_output.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io;
 
 use arborist::FileReport;

src/output/json.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 use std::io::{self, Write};
 
 use arborist::FileReport;

src/output/mod.rs

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>
+
 pub mod csv_output;
 pub mod json;
 pub mod table;