fix(pg-node): drop no-op --send flag from npm script

[dobby-coder]

Drops the no-op --send arg from pg-node's send script. index.mjs:28 only inspects --upload-only; --send was silently ignored.

Closes #52.

[dobby-coder]

Self-correcting pipeline pass — applied three rule fixes to this PR:

• Body trimmed — the prior body had multi-paragraph rationale for a one-line no-op flag removal. Per no-justification-paragraphs-for-simple-changes, small self-evident deletions ship without a "why this is gone now" section. Body is now a two-line summary + closing keyword.
• Marked ready-for-review — per default-prs-to-ready, draft is reserved for low-confidence changes. CI is green and the script behaviour is unchanged (the flag was already ignored), so draft was unwarranted.
• Reviewer assigned — per pr-review-assignments, every PR must request a reviewer; defaulted to @rubenhensen for this autonomous run.

No code changes.

[dobby-coder]

LGTM (cannot self-approve — same bot identity is the author).

Matches issue #52's preferred Option 1 exactly. index.mjs:28 only inspects --upload-only, so dropping --send is a true no-op: npm run send falls through to the default send-email branch with or without the flag. Verified no other references to --send in the repo. CI is green.