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* feat(store): refuse to install a plugin that needs a newer core `ledmatrix_min_version` was decoration. The loader logged an advisory warning and continued; the store never compared the core version at all, so a routine "update" delivered a plugin that could not run. That is the gap phase B6 (the sports-unification sunset) cannot be done over: deleting a plugin's bundled fallback while nothing enforces the floor hands un-updated users a scoreboard that raises ModuleNotFoundError at load and is reported only as one line in the journal. The gate lives in install_plugin, after the manifest is on disk and before dependencies are installed. That is the earliest knowable point -- the registry carries no compatibility field, so the floor is not visible until the files are down -- and it is also the chokepoint: _reinstall_with_rollback calls install_plugin, so a refused *update* restores the version the user already had, for free. Floor resolution and the comparison move to src/plugin_system/compatibility.py, shared with the loader so the two cannot drift. Both read all four spellings published manifests use, including the deprecated `ledmatrix_min`. Refusal requires evidence. An undeclared floor, an unparseable version on either side, or a core below TRUSTWORTHY_FLOOR (2.0.0) all allow the install. That last one is deliberate and load-bearing: the v3.1.0 release reports __version__ = "1.0.0" while nearly every published manifest floors at 2.0.0, so a strict gate would lock those users out of the plugin store entirely -- much worse than the problem being solved. They stay unprotected until they update the core, which is also what fixes their version string. Verified: 782 core unit tests pass, including 25 new ones and the existing loader-warning suite unchanged (the refactor is behavior-preserving). The install tests drive the real install_plugin path with the download stubbed -- the allow and refuse cases differ only in the declared floor, so the refusal is demonstrably the gate and not an earlier bail-out. Follow-ups, deliberately not in this PR: surfacing the reason in the store UI rather than only the log, and publishing the floor in plugins.json so the store can refuse before downloading. Phase B4 in docs/SPORTS_UNIFICATION.md. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5 * fix(store): a failed install must not destroy the plugin it replaced Found while validating the compatibility gate. `_install_plugin_impl` deletes the existing plugin directory *before* downloading, so any failure after that point leaves the user with nothing. `_reinstall_with_rollback` protects the update path exactly this way; a direct `install_plugin` had no equivalent. The gate made this reachable in a new way: a plugin whose declared floor exceeds the running core is now refused *after* the old copy is already gone. Floors are hand-written and can be over-declared, so the refusal could remove a plugin that had been working fine on that core. install_plugin is now a thin wrapper that renames any existing install aside, delegates to _install_plugin_impl, and restores it on failure -- including when the implementation raises, which is re-raised after the restore. It is a pass-through when nothing is installed and when called from _reinstall_with_rollback, which has already moved the old copy aside; a test pins that so the two mechanisms cannot start nesting. The aside name embeds '.standalone-backup-' because plugin_manager._scan_directory_for_plugins keys on exactly that substring to skip backups. A different name would have made the backup discoverable as a duplicate plugin; a test pins that too. 789 core unit tests pass, including 7 new ones. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5 * fix(store): serialize concurrent installs, and make the lock reentrant Second bug found while validating the previous commit on hardware. install_plugin's new set-aside/restore had no lock. The web UI runs Flask threaded, so a double-clicked Install button gives two threads the same plugin_id; interleaved, one thread's restore deletes the other's freshly installed copy. _reinstall_with_rollback already guards exactly this with a per-plugin lock, and install_plugin needs the same one. Taking that lock naively deadlocks. _reinstall_with_rollback holds it across its call to install_plugin, and threading.Lock is not reentrant -- so the request thread hangs forever on the standard monorepo update path (update_plugin -> _reinstall_with_rollback -> install_plugin), which is to say on every plugin update. Verified by reverting to a plain Lock: the regression test times out after 10s instead of passing. The per-plugin locks are now RLocks, and install_plugin holds one for its whole set-aside/install/restore sequence. Verified on devpi (Pi, Python 3.13.5, real registry and network): - update_plugin on an up-to-date plugin: True in 5.4s - update_plugin forced through the full reinstall-with-rollback path: True in 13.1s, correct version restored, old copy replaced, no backup directories left behind - install -> reinstall-over-existing -> failed-reinstall-restores: all pass against real downloads - 22 plugins load, no tracebacks, web API and UI 200, steady-state journal 50 lines/min 791 core unit tests pass, including 2 new concurrency tests. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Udr6MfaFLUPhX5Fgo67Jf5 --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>