CLAUDE.md: name the two path lists a new non-source file must join

[thedavidmeister]

Closes #114

"All source files must include SPDX headers" was the whole licensing
instruction, and it covers only the files that carry a header. reuse lint is a
required gate — .github/workflows/rainix-sol.yaml calls rainix's
rainix-sol.yaml, whose legal job runs it — and it covers every tracked file,
not just source.

The repo licenses its non-source files through a hand-maintained path list in
REUSE.toml (16 entries: .gas-snapshot, .github/workflows/**/, CLAUDE.md,
foundry.toml, flake.nix, …). A session adding a new root-level or config
file gets a red reuse lint and nothing told it where the fix goes.

The same file also has to be listed in .soldeerignore or it ships inside the
published rain-factory package. Nothing gates that at all, so it fails
silently. #52 previously removed stale entries from exactly these two lists,
which is the evidence that they are maintained by hand and drift.

CLAUDE.md is 3906 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 #164. That one rewrites the second
sentence of this same paragraph (the SPDX header content); this one appends a
third. 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: REUSE.toml and .soldeerignore as they stand in the tree, and
  rainlanguage/rainix/.github/workflows/rainix-sol-legal.yaml for the gate.
• Category check: the instruction appears once. README.md carries no
  licensing or packaging instruction, so there is no second copy to correct. The
  inverse defect — entries in these lists naming paths that no longer exist —
  was Remove the submodule-era residue — REUSE.toml and .soldeerignore still name foundry.lock and .gitmodules, neither of which exists #52 and is already closed.

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