Docs: add v1.7.2.4.1 roadmap entry, fix stale lock-file limitation

[Wewoc]

… lock-file limitation

New ROADMAP.md entry for v1.7.2.4.1 (planned) — self-updater startup handshake + auto-rollback via _update_backup/, replacing today's silent-failure behavior in updater_helper.ps1's GUI-triggered path. Handshake shape (app writes a success flag once up and interactive, helper polls with a generous timeout) chosen over a plain PID-liveness timeout after review: a bare timeout races against first-launch AV scanning and doesn't distinguish 'alive' from 'actually started correctly'. Entry documents an open design point (the existing migration confirmation dialog must not gate the flag, or a user who hasn't clicked yet triggers a false rollback) and a correctly-scoped data-safety caveat (mcp_cache.db is an additive-only, rebuildable proxy cache outside ExeDir — the real analogous risk is the archive structure migration behind _check_migration(), already interactive/ opt-in, out of scope for this round).

Placed directly after 'Currently stable — v1.7.2.4', ahead of v1.7.2.5/v1.7.2.6 — it is a patch on v1.7.2.4, not a successor to v1.7.2.6, so version order puts it first regardless of write order.

Also fixes a stale-docs inconsistency found during the same review: CHANGELOG.md's v1.7.2.4 'Known limitations' and ROADMAP.md both still claimed no lock file existed against concurrent update triggers, but updater_helper.ps1 already has one (_update_helper.lock), added within that same v1.7.2.4 commit. Removed both stale mentions.

Claude-Session: https://claude.ai/code/session_011Z4cpStY3EYYqyd1CLsGhJ

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• src/docs/CHANGELOG.md
• src/docs/ROADMAP.md

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