CRITICAL (Opus HALT on prior commit): the PR's edit to save_settings() replaced
'if k in _SETTINGS_ALLOWED_KEYS' with 'if k=="dashboard_plugins": continue' and
orphaned the whole validation body under the continue. Effects: (a) settings save
broken for every key except dashboard_plugins; (b) the allowlist security boundary
gone -> any client key (password_hash, signing_key_*) became settable. Restored the
guard + correct indentation; dashboard_plugins handled by the deep-merge above.
Verified in-process: language persists, password_hash/signing_key injection
rejected, dashboard_plugins still deep-merges.
Also (Opus SHOULD-FIX #3): validate plugin name against ^[a-z][a-z0-9_-]{0,63}$
so a manifest name like '../foo' can't make the URL-space ambiguous.
Regression tests added for both (the allowlist bug had ZERO coverage).
- Remove unused imports (importlib, sys in api/plugins.py; pytest in test).
- Two tests asserted 'X or True' (always pass — meaningless). Rewrote them to
actually verify the /plugins/ route allowlists plugin.css + uses relative_to
traversal guard, and that manifest fields are html.escape()'d before IIFE-shell
interpolation. Dropped a dead 'original_plugins' local for a real dict assertion.
nesquena-hermes