Fix stale tool example paths

[andrewboudreau]

Fix the five dead references introduced by #1990 by pointing examples at paths that exist on current main. The marker-evidence examples now say explicitly that they refer to byte-matching historical revisions. This is comment-only and leaves the dead-reference baseline unchanged. Validated with check_dead_references plus both dead-reference test suites.

[tangos-validator]

✅ PR validation — Passed

noverify: no source/build-data changes in this PR

_{Each changed src/*.c|*.cpp is compiled and its relocated bytes compared to the binary data on a private build box. Passing requires every changed file to reproduce the ROM byte-for-byte with correct relocation targets — this catches WRONG-DEST relocations and non-reproducing near-misses that ledger-scoped linkcheck skips.}