chore(ci): repoint push-email-notify to smtp-notify-action

[hyperpolymath]

Replaces dawidd6/action-send-mail with hyperpolymath/smtp-notify-action v0.2.0 (tag commit ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7), per the 2026-09-02 ruling (standards spec §5.5/§9, PR hyperpolymath/standards#725). The whole file is replaced with the rsr-template-repo canonical, which — besides the uses: line — restricts the trigger to branch pushes (tag and deletion payloads mislabel Branch:/head_commit), sets timeout-minutes: 5, carries a deliberately per-run concurrency group, and grants only contents: read. How many of those are actual changes here depends on how far this repo's copy had drifted — read the diff, not this list. Dormant gating on vars.PUSH_EMAIL_ENABLED == 'true' is unchanged. Line 1 SPDX header kept as it was.

Engine: .git-private-farm/scripts/smtp-notify-sweep.sh. Verification for this repo: regime=lock pristine=valid post=valid changed=.github/workflows/actions.lock,.github/workflows/push-email-notify.yml, sig=G 8650cbc canon=543fc1474b54 base=main
(pristine/post = gh actions-lock --no-fix validity before/after; repair = the lock was already invalid before this change and is valid after it.)

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Reviewing files that changed from the base of the PR and between 91a39da and 8650cbc.

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• .github/workflows/push-email-notify.yml

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