fix(release): make README.md / CHANGELOG.md optional in archive bundling

The .goreleaser.yml `files:` entries were bare filenames (`README.md`,
`CHANGELOG.md`) which goreleaser treats as required: globbing fails
hard when the file doesn't exist:

  globbing failed for pattern README.md: matching "./README.md":
  file does not exist

This bit v0.4.2 — every release would fail after #168 wiped the docs
until the new reference docs land.

Switch each bare filename to a glob (`README.md*`, `CHANGELOG.md*`).
Goreleaser silently skips patterns that match zero files. The trailing
`*` matches the file when present and nothing when absent — gracefully
covering both "docs landed" and "docs not yet rewritten" states.

`LICENSE*` already used this pattern. No behavior change when a
README is present.

`release-darwin.yml` already wraps its `cp` commands in `|| true`,
so it was unaffected — only goreleaser-side bundling broke.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: aksOps

.goreleaser.yml

@@ -62,10 +62,15 @@ archives:
     formats: [tar.gz]
     name_template: >-
       {{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}
+    # Each entry is a glob; goreleaser silently skips patterns that match
+    # zero files. The bare `README.md` / `CHANGELOG.md` form would hard-fail
+    # when the file is absent (docs were wiped in #168 ahead of a clean
+    # reference-docs rewrite). The `*` suffix turns each into a glob that
+    # matches the file when present and nothing when absent.
     files:
       - LICENSE*
-      - README.md
-      - CHANGELOG.md
+      - README.md*
+      - CHANGELOG.md*
 checksum:
   name_template: 'checksums.sha256'
   algorithm: sha256