CLAUDE.md: a source file carries two SPDX lines, not one

[thedavidmeister]

Closes #164

"All source files must include SPDX headers" states no header content. Every
.sol in the repo carries two lines, not one:

// SPDX-License-Identifier: LicenseRef-DCL-1.0
// SPDX-FileCopyrightText: Copyright (c) 2020 Rain Open Source Software Ltd

Checked across all 19 tracked .sol files — both lines present, byte-identical,
in every one.

reuse lint fails a file carrying only the identifier, and the identifier alone
is the shape written from this instruction, since solc itself warns about
nothing else. The copyright holder string is not derivable from the sentence, so
a session had no way to produce a passing file from the doc.

The sentence now says a .sol copies the two lines its siblings carry. The
issue proposed spelling both strings out inline; pointing at the siblings is
shorter, cannot go stale if the holder string ever changes, and leads to the
same two lines. CLAUDE.md is under a byte cap, which is why the shorter form
wins.

CLAUDE.md is 3829 bytes on this branch against the 4096 agent-context-cap
(3807 on main). With all seven CLAUDE.md fixes from this audit batch landed it
comes to 4048.

Textual overlap with the PR closing #114. That one appends a third sentence
to this same paragraph (the REUSE.toml / .soldeerignore path lists for
non-source files); this one rewrites the second. Both branch off main and each
stands alone; I merge main into whichever lands second and resolve.

QA

• Discriminating tests: n/a — CLAUDE.md is process documentation, and tests
  never assert doc text.
• Mutations applied: n/a — no src/ or test/ code changed.
• Oracle: the 19 tracked .sol files' first two lines, and REUSE.toml's
  annotation block, which supplies the same two fields for the non-source files.
• Category check: README.md carries no licensing instruction, and the
  deprecated interfaces' own headers carry the two lines like every other
  .sol, so this sentence was the only place the header shape was stated.

🤖 Generated with Claude Code

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• CLAUDE.md

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