chore: add docs branch trigger to verification workflow

[CoderDeltaLAN]

Adds docs/** to the push branch triggers for the verification workflow.

Scope:

• update only .github/workflows/verify.yml;
• add docs/** to push branches;
• keep pull_request validation unchanged.

Reason:

• documentation branches were validated by pull_request checks;
• Always-Green discipline is stronger when docs/** push branches also create workflow runs.

Constraints:

• no README changes;
• no index.html changes;
• no assets changes;
• no documentation content changes;
• no generated/vendor artifacts.

Local validation:

• scripts/verify.sh OK;
• git diff --check OK;
• pre-push validation OK.