docs(commands): make arch-decide examples timeless, standardize ADR statuses

Two audit fixes. Sample ADRs asserted technical claims as timeless fact (MongoDB transactions). The example is now dated and sourced, and a "cite, don't assert" rule requires a link, version, or checked-date for any concrete technical claim. The status vocabulary was mixed (Accepted, Decided, Superseded, Not Accepted). It's now a canonical five (Proposed, Accepted, Rejected, Deprecated, Superseded) with an explicit immutability rule: an accepted ADR's body is frozen, and a changed decision gets a new superseding ADR while the old one stays as the record.

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