Beta Branch add cmsec check progress banner so users see immediate feedback in 140.00beta01

add cmsec check progress banner so users see immediate feedback in 140.00beta01

Interactive `cmsec check <cve-id>` runs printed nothing for ~1-2s while the
script's startup probes ran (function defs, OS detection, /etc/os-release
parse), making users wonder whether the command was hung. Add an immediate
"Running <CVE> / <label> check (read-only) — please wait..." banner at the
top of the begin-checks block in all three check scripts so the cursor is
no longer just flashing.

Banner uses say() which is gated on QUIET=0, so:
- Interactive (no flags): banner appears immediately, then the normal
section-by-section report follows.
- --json: QUIET=1 (set by --json), banner suppressed, JSON output stays
clean for parsers (cmsec.sh:254 awk + dmotd.sh:577 grep).
- --quiet: QUIET=1, banner suppressed (user explicitly opted out of
narrative output).

Changes:
- tools/cmm-security/checks/check-cve-2026-31431.sh: banner before os_id
parse.
- tools/cmm-security/checks/check-cve-2026-43284.sh: same.
- tools/cmm-security/checks/check-cve-2026-43500.sh: same.

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Branch parity with 141.00beta01 (commit adff8395) and 132.00stable;
tools/cmm-security/ remains byte-identical across all three branches.

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140.00beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/140.00beta01
• Commit History: https://github.com/centminmod/centminmod/commits/140.00beta01