dsh-coding-tools v0.1.5

Live Settings reconciliation for code_read, edit_ranges, ast_grep, and lsp. Availability and approval changes now unregister/register exact tool definitions without restarting DSH Web after v0.1.5 is active. Reconfiguration guards dispatch, cancels and drains old calls, quiesces AST/LSP resources, invalidates stale cursors/observations, and fails closed on activation errors. Adds adversarial startup, rapid-commit, schema-phase, cancellation, activation-failure, and unload-race coverage. SHA-256: 98e4982bb0f4961d90ffd5b85e21c4c81ceeb4fb39c8962e59fcc8a6739d301b