[W5TSU]

Release prep for 26.10.7: the version in all five places (CMakeLists.txt, README.md, AGENTS.md, CHANGELOG.md, the AppStream metainfo) and the ROADMAP cycle heading.

The CHANGELOG.md section is the release notes, written from #78, the only PR merged since v26.10.6:

• HackRF on Windows: libhackrf built with MSVC and bundled in the installer, portable ZIP and MSIX (HackRF backend — highly experimental (RX+TX, satellite FM/CW) #42).
• An unplugged HackRF now disconnects cleanly and can be reconnected, instead of freezing (HackRF backend — highly experimental (RX+TX, satellite FM/CW) #42).
• The x86_64 AppImage builds again. v26.10.6 shipped without it and without GPG signatures.
• Icom: the fail-safe transmit-off goes out at once ([sanitizer] ASan + UBSan weekly run failure (fp a9221cdb92c4) #47).
• For testers and developers: tools/hackrf_unplug_test.py, setup-hackrf.ps1, the simulator disconnect fix ([full-suite] test suite failing on main (fp 9aedc16d4457) #75), and the sanitizer lanes ([sanitizer] TSan weekly run failure (fp 3b4875c15d2e) #46, [sanitizer] ASan + UBSan weekly run failure (fp a9221cdb92c4) #47, [sanitizer] TSan weekly run failure (fp 38fbf8da7362) #80).

ROADMAP: the HackRF highlight gains v26.10.7, and the multi-slice item links #79.

python3 tools/release_notes.py --check: OK.

After merge: tag v26.10.7 on the merge commit to build the AppImages, DMGs and Windows installer and publish the release.

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